Finally Got Ahead of the Pet Game

I must admit with the (it felt like) several Super Squirt days close together recently I have run out of pets that needed to be leveled and now I look at what is left in my collection and kind of randomly choose things to go in my leveling queue.

What do people prioritise after you have what you need? Pets for selling? Alternative breeds? Or just start at A is for Abyssius and work your way down alphabetically?