a few of us were lucky to test out the pet battles for the short time they were available, my question is do you currently have a favorite pet?
For those who weren't lucky enough to test out the battles you can check out the battle pets here:http://www.wowdb.com/spells/companions/battle-pets
Some of them have their abilities posted on their and you can base your opinion on the flavour/mixture of their abilities.
Mine might be Nether Ray Fry as it has 6 damage attacks from 6 different families those are beast, magic, dragonkin, flying, undead and elemental. Not only that but arcane blast, tail sweep and slicing winds are a little different to the basic damage attacks, you can build up your arcane blast damage at the start of the fight, you can try your luck with slicing winds for a chance to do more damage or you can attack with a tail sweep if you are facing a fast pet for double damage when attacking second.
I know the gurkster also has abilities from 6 families but some aren't damage abilities, Nether Ray Fry on the other hand can do double damage vs 6 different families and that is pretty insane. Your favorite doesn't have to be based on damage etc. it could just be based on the one with the most fun abilities.