+7 energy, just like +5 armor is better than +30hp, if u need 35hp to survive then ur gonna die anyway, while 7 energy is very useful, especially on assasins, and warriors too.
Also, no damage tank, don't forget, most attack skill come with a +xx damage bonus, wich is armour ignoring, so health additions is surely better than +5 armour. ( in PvP )