Today(week) I researched these two sillies for a mu, you should check it out but the debate is here:  
We are gonna have to bring up the canon of both series as scaling heavily depends on them so lets establish stuff:

Starting with the kitsune as his is simpler: Hansel started off as an FPE oc in Advanced Class but after ENI left the fandom she took her fav characters and used them in LNUL giving them new stuff. Hansel is a funny case as he not only does not scale to the verses higher stuff(the low and mid ends are human, athlete, street+, wall+, small building, mostly thanks to him being 15 ft, then there's high ends like fucking ISLAND WHICH SKIPS TO MULTIVERSAL) but this version only is city level via DC, his AP is merely small building which he may physically scale to. Too bad he doesn't even get powers or anything because he was a WENDIGO IN ADVANCED CLASS and only became a kitsune fox in LNUL as his new lore, everything about him has changed, including personality though he should retain stuff from the Hansel and Gretel comic as it never contradicts anything we see in the AMV. Also its officially just not canon anymore, meaning Barrel's railcanon cannot scale to his AC counterpart's railcanon which is where island level comes from(imo the feat seems a teensy bit bloated ngl wiz). Everything will be used for his current version including more dubious(aka blatantly non canon stuff) as he has very little media compared to Grandpa, though the original Hansel and Gretel comic should be fine as there is no contradictorily lore there and from what we know all events are the exact same

Speaking of which, Grandpa will be gaining a soft composite as in lore every video series we see in Culter35 is its own timeline stemming from the main timeline, however he constantly breaks the fourth wall and the Grandpas from other timelines all seem to know the siren head video as the most viewed video. Other characters, Grandpa included, can also remember their memories from other episodes casually. I am saying this as its unclear whether or not all of the series is an in universe web show or real, with the answer being both. Grandpa doesn't exist as a real person in the lay offs video but is directly real in the replacing my grandpa video. Similarly Homeless man despite not being real and being played by Toph, kidnaps Anthony and Ryan and reads his Christmas stories... Which contains both Anthony and Ryan alongside more characters who directly break the fourth wall and talk to homeless man from within said story. So Grandpa will be scaled accordingly, though we are only giving him stuff he doesn't lose by the end of the episode so no magic book or Beetlejuice powers

Despite what many people would assume this is quite close! Deadass I was expecting fully to see either stomping or having some insane powers but they are unfortunately rather grounded, so we will be separating it into stats, equipment, powers and aptitude

Stats:  
Low ends:  
The most useable calc for Hansel which can be attributed to his physicals is scaling to the goat: Ryomen! who tanks an attack from Barrel's machine gun arm which via statements can pulverize concrete and combined with blast size Ryomen would have to be casually in the wall+ to small building ranges(consistent with The Evil blowing up a wall) with subsonic speeds to block it(their is no evidence for Barrel's bullets to be faster than regular ones). Decent but surprisingly Grandpa has it beat via massively upscaling Antony who can survive mecha siren head's self destruction which when scaled to its size would be in small building to building level, which is consistent with Grandpa's personal feat of chucking a milk carton at santa's slay making it explode landing large building level. Also upscaling lower tiers in the verse he has more direct bullet dodging to pull from, though admittedly they would be likely slower than Hansel by a small margin  
Mid ends:  
This is where I personally think these two should scale to. Hanse'ls fire feat is the same as his FPE version but he can actually use the fire as AP getting to small town-town level tho large city can be reached via DC. He also probably survives Barrel's railcanon which gets to MCB-Small town, nothing for speed however. Grandpa no sold the damage of and out slapped both werewolf Ryan and vampire Andrew's slaps, which is kinda busted as Ryan sent him around the world which gets to large town level with sub-realitivistic speed as Ryan catches him, but it can be buffed to small city assuming he did the earth more than once. Andrew's nuke slap gets to small city to city+ aswell. Grandpa should also scale to Ryan reacting to his lasers in the super powers video getting upto 0.67c(kill me)  
High ends:  
These ends are unusable dawg, being non canon and massive shitty outlier respectively. Hansel can take Barrel's FPE version's railcanon which is island while Grandpa scales to Andrew's skeleton surviving a small country level explosion, Gramps takes stats no matter what

Equipment:  
While you would expect Grandpa mauls here, they both have no shit for equipment. Hansel at best you could argue having healing herbs assuming that the original Hansel and Gretel's comic plot is still canon, which offers low-mid regen but while Grandpa typically has more weapons, like his cloning machine, explosives, trident and fixed dream machine, the haxxier stuff simply have too much setup needed... Except for pokeballs and as they are kept in his inventory, though their useability is questionable as he doesn't have them at all times, which can be said for Hansel's medical weed aswell. This category technically goes to Grandpa, buuuutttttt this is non factor for both due to them never holding them for long, but also because Grandpa's tech advantage gets countered in-

Powers:  
Both Lord Hansel and Grandpa have very different kits with both being able to teleport, turn into plushies and seemingly be somewhat able to talk to people in their minds, however Grandpa taking versatility in spades thanks to him being the canon Mewthree of his verse, despite being a trainer whose also Grandpa, and Anthony who in the pokemon videos transforms into a Grandpa with nothing really suggesting he wouldn't have their wide list of powers, however despite the gap Hansel could keep up regardless with both having counters: Grandpa's technology gets countered by Hansel's technopathy, Hansel can levitate making him hard to hit for Grandpa and being able to spam his projectiles and vines but Grandpa could bring him down via Telekinesis and paralyse him via thunderbolt, Hansel could camp in a random piece of tech with a screen and has better AOE but Grandpa can keep up via substitute allowing him to transfer all the damage to his plush form and earthquake to have his own, albeit inferior, AOE. Both had transformations which could up their stats via Hansel's true form and Grandpa's werewolf transformation, Hansel could lessen Grandpa's power advantage and laser eyes thanks to his type 2 immortality and decent regeneration alongside him tanking the railcanon which negates regeneration. Hell, both even had hax options the other couldn't counter, being Hansel's marketization(plushie transmutation) and Grandpa's Lullaby(sleep inducement) and hypnosis which could incapacitate the other, this is a tie as both had way too much stuff which could counter the other just fine

Aptitude:  
So with Hansel's regeneration and more useful insta win hax vs Grandpa's better stats and versatility meant that this fight came down to who could fight the other better and this is a weirdly close call. In terms of age, both would be vaguely similar in age being likely in their 80s but going deeper into lore, Grandpa being there for the invention of mustard unironically outdoes Hansel being created when kitsune foxes were conceived(3000 BC vs 100-300 BC)... but in the context of Culter35 this would be more on the 17th or 18th century meaning Oldness could go eitherway however skill is more odd. In terms of skill both have fought rather impressive people head on with Grandpa fighting Ryan who is a taekwondo master(or kung fu aswell), same Ryan who defeated deadpool and same Ryan who died against the halloween killer in combat, who Grandpa killed by the end of the episode in a fight. Hansel fought Barrel who is now in early adulthood(before he fell in love with Hotchkiss) and a bio weapon who should be an assassin of sorts however the gap in skill really just comes down to the nature of their powers and how they fight, Grandpa actively has to match his foes in raw skill due to how he typically fights while Hansel actively relies on his powers for confrontations and rarely ever directly fights, FUCK, he was shown to be actually predictable with his teleportation and just threw the fight(though he likely wasn't being serious, except for teleportation, mf did get caught lacking). Also Grandpa generally takes fights far more seriously and is just as ferocious at his peak. Grandpa also was generally smarter considering he invented his dream machine but both are sort of air headed when not in combat, but Grandpa has been facing threats like Hansel for a long time and has more experience against supernatural threats than Hansel while Hansel has never fought anyone quite like Grandpa, or atleast never fought a 5'4 ft mf while being 15 ft tall. Not to say Hansel was hopeless as he is competent at using his abilities for combat and more creative with his powers. However skill shockingly affects their hax, not only how much they use said hax with Hansel never using his transmutation mid combat and Grandpa using his in an actual fight but also because he can actually still fight as a plushie via quick attack and may turn back if defeated with full health due to how substitute works. This also extends to their fourth wall breaking but in reverse because while both have generally the same fourth wall awareness with both acknowledging their most popular video starring them(The Siren Head sighting and I am in your memories hunting you down) and talking directly to the viewers(Grandpa being in the outros instead of Anthony in some videos and Hansel asking people to donate to his plushie so it can become real, alongside the lil Gretel plush), Hansel actually tears through the animation to jumpscare us(fucking dick-) in the why are you awake animation and actually interacts with his past self(this part maybe wrong, also funfact: his FPE version actually has a timestop and more example of breaking the fourth wall) while the best Grandpa could muster was debatably immersion from entering the TV in I am stuck in TV show 2 even though it was explicitly just a portal. But overall Grandpa was simply a better fighter and had the more useful skills but Hansel was not far behind.

Conclusion:  
So with all that being said, the Lord of the Color Forest was a formidable foe with his impressive size, aggression, wits and rather impressive set of abilities with many counters and better longevity via his regeneration but the predator has become prey hunting the hunter as the Patriarch of the Mennella Family's superior physicals, more versatile tools, counters of his own, experience and also that fucking speed advantage(at best hypersonic vs at least sub relativistic) was enough to ensure that yet another monster was slain and he never has to deal with it again. 

The winner is Grandpa

Thoughts and stuff:

I was NOT expecting to unironically have so much fun researching and coming up with something that can work as mu between these two characters of all things. Culter35 has been really nostalgic for me and them still uploading videos to this day makes me happy(except for the AI thumbnails, they definitely are much better and better used than most channels which use them though and aren't used in videos so we are good) while ENI I had been a passive fan of ever since her FPE au and seeing her become something so much bigger and professional gives me LIFE and I wish best for both channels in the future. Also I would not care who wins as both are my favs and most interesting characters from their series and both sillies 100% deserve whatever fate the other will have in store if they win. As for other mus, this is not best for both by a longshot. Alice/Alisa from Tiny Bunny or fucking Rhubarb from the YTP series Max and Rhubarb are much better and somehow thematic mus for Lord Hansel while Grandpa doesn't really have mu I fw yet, maybe the boondocks old guy I forgot the name of but other than mmaaaayyybbeeeee suction cup man noone really intrigues me as this mu.

My take on... Grandpa vs Lord HanseΓ? (Culter35 vs ENI/The Enigmaverse)