Support Units: Sorcerer vs. Wind Mage

As the title says, i am currently wondering whether i should replace both my sorcerers with wind mages as sorcerer's don't even show up in the Unit Tier List while wind mages are named as a good temporary solution for all unfilled support slots.

Right now, i am more or less running a 4c to farm some materials but i will most likely go back to undead 2c very soon. Afterwards, i will have two wind mages and two sorcerers.

Benefits of the sorcerers (per unit):

• Special Skill 1: Increased Game Speed 2%
• Special Skill 2: Attack and Move Speed 2%
• Special Skill 3: Offline Speed 5%
• (Totems? Not sure if they're actually any good for me right now...)

Benefits of Wind Mages (per unit):

• 9% Ranged Crit (at +300, which i can easily afford for all of them)
• (Possibly blowback but i'm not sure if that will even work on +300)

So, what would you suggest that i do? Keep my two sorcerers or replace them for a total of 4 wind mages?

Due to having just started about a week ago and having barely managed to purchase all buyable artifacts (but not upgrading them very much), my UD crit is really low (18.2%), so i currently tend to go for the wind mages but then i'm just not sure because the sorcerers are actually full support units and the wind mages are not...

What would you guys suggest?

Thanks in advance for your help!