RG40XXV Best Beginner's OS

Hey guys, so I recently purchased my first RG40XXV retro handheld and I'm not sure what OS I should use. I've been watching some YT tutorials regarding KnulliOS, MuOS and the pre installed OS. Imo MuOS is a bit to intricate for a beginner who's got no clue in software, coding whatsoever. Should I try KnulliOS? The reviews seem to be quite promising with all those preinstalled features so that you don't even have to get into retroarch. I mainly wanna play Pokemon ROM hacks as well as some Nintendo Classics. Hopefully Ocarina of time might run on this device. What's your opinion?