If you had to pick one pet, which is the Best.

I am leveling every lass to 80. And of course summoner is last. I just want a basic build to learn on. what is the best pet to get and level??

best pet by far is Wanda/Jinga hands down, both are the most well balanced pets and work in any situation, so if you want to focus in one pet per time focus on Wanda or Jinga or you can focus in Wanda and then evolve to Jinga just remember to get another Wanda later to get the weekly pancakes

No pet is the best they all have their own use's but best overall pet for all content is jinga