Honestly, I find myself using a wide variety of pets, both because it's more fun, and because of the varying utility. I actually have been using a snake for PvE because it is a cunning pet, and has Roar of Recovery (which is having it's cooldown cut in HALF

). I recently picked myself up a spider for the same reasons (and web is great for PvP),but i still have a wolf, cat, and scorpid when i get bored of my snake/spider.