In need of CO-OP partners!

I just started the True Vault Hunter Mode on the Pre-Seq. I am a level 40 Baroness. PSN:ViolentSpace

Is the baroness good? I am about to start BTPS and I love the skills but I have heard that she is not so good at killing bosses so I am leaning towards a Nisha. Which I think is boring but good at killing everything. Please advise.