I voted Phoebe but now I’m thinking Joey. They both serve as an antidote to all the bougie of the other four but Joey just isn’t all that interesting by himself.
On a personal preference level, I really dislike Rachel and by extension, Jennifer Aniston. I guess that’s a credit to her acting; I don’t dislike her in other things I’ve seen. As Rachel, I’ve come to hate her face. And her voice.