Being evil without joining the goblins

Hi, i want to go for an evil bg3 playthrough, but from what I've seen, people's dont really enjoy joining the goblins, as it feels unrewarding and really mean just to be mean.

Is there a good reason to help the goblins ? I feel like it would be more logical to help the tieffling, thus gaining more power by acquiring tadpoles and magical items, and then betray the tiefflings into act 2 with shar quest.

What do you think?