Well, wind serpents (in fact all beasts from the Cunning group) have a talent which restores 30% of ur total mana over 9 secs, plus - they have a chance to not lose focus when they use abilities

All the beasts from the Ferocity group, however, have a talent which gives 10% AP for 20 secs to the whole raid. Devilsaurs suck...
It depends, my love... It depends...