Berserk should attacks faster as long as stays in combat.
Muisca Temple Guard should regenerates HP.
I think this way, both units fits better with the flavor of their respective civs.
Berserk supose to be an aggressive shock infantry. Regen ability is more a conservative bonus for them.
In the opposite, temple Guard sounds like a defensive or support unit. Attacking faster in combat shounds like you want them always in combat which sounds more an aggressive bonus.