Side Note: There's also the difference between single target attacks, and multi-target or room attacks to consider when looking at control vs. power for spells. The moment you try to attack multiple targets, IMO, raw power become advantageous over hitting "better" depending on how you attempt to attack them (I really need to re-read the attack rules). IIRC, raw power will have a distinct advantage when you're trying to attack multiple specific targets in the same zone (split fire) vs. just attacking the room because you have to split your shifts between multiple targets.