[LordArioch]

I'd say it depends very much on the units in question. Battle vestals or serpent dancers get very little benefit from regen/beserk because any hit is likely to kill them, but gain immensly from +4 prot. However, niefel giants, black hunters, or black templar, are all very likely to take small amounts of damage that they can regen from and go beserk, and +4 prot isn't as helpful for them. Especially the templar...it won't even go up 4 and 28 isnt that much better than 24 in practice. However the earth reinvig becomes important for these same units.

It is wonderful to make high nature black templars and watch archers hit them for 1-2 damage which they regen, and just watch them go beserk.