V2 is Earth test v3 is the Air test, Percy will always be base fire because Begone! + Percy's branding and movement on a 2 power body are the entire reason it's worth playing. What I know for sure at this point is that Percy tops out at 5 mana and threshold can be a real issue if you don't get to your 6th site. I also know that drawing a Accusation any later than turn 2-3 feels TERRIBLE every time so they are gone. Likewise tapping something for a holy water doesn't really ever feel *good.* Arbalest is fire, and sphere of animosity is unfortuntely the main way to beat Pathfinder/Battlemage/Bladedancer in the air build. Gift of the serpent is amazing basically every time, and whirling blades is the absolute truth in this meta. I've played with 3, and I'll likely go back up to it in the air list. Percy's mobility makes poison nova an interesting include especially since it only demands a single threshold. Root spider is still a very good card that puts in serious work. Using town priest to bounce your own demons feels awesome. Archangel Michael is the 2nd best card in this deck after Begone! and the fury road style attack plan still holds up, but this list still needs a lot of work.
TLDR I don't know which version is better, but maybe we'll find out!