OFFENSE

Silverback - Best lagging move of any form short of quest forms; 2nd most tanky of all the offensive forms
Lion - High damage output + solid high damage lagging move. You could replace Lion with Rhino and I'd be alright with it


DEFENSE

Komodo (old?) - If it's been nerfed...well it probably should have been.
Porcupine - You can actually kill people with a defensive form!


UTILITY

Cheetah - Nuff said
Fox - Detect Hidden/Camo is pretty sweet, plus it's decently tanky. You could replace this with Trapdoor Spider and I'd probably be fine.


AIR

Falcon - Um...it's fast and hits hard.
Golden Eagle - What I said above. I'd be fine with hummingbird/vulture as well, depending on other forms.


WATER

Shark - DAMAGE IS KING. BOW BEFORE DAMAGE
Eel - NO LAG IS KING. BOW BEFORE LAG.


HALLOWEEN

Otyugh - It's really kinda gross. I'd still take Cheetah over it, but just barely.
WHATEVER THE DEFENSIVE FORM IS


QUEST

Displacer Beast - Was Jack Blaguar before Jack Blaguar
Giant Clam - Yup.