No way in heck he’ll pick either of those two. He wants somebody who won’t outshine him, which is going to be pretty hard, because he’s not exactly a leading light himself - he’s not very bright (just really, really ambitious!), not quick on his feet, not a good speaker. And he wants somebody who won’t be too conservative, because he has very, very liberal ideas that he has tried to cover up for the campaign and he doesn’t want to be challenged on them.
I don’t think he’ll stoop so low as to pick a GOP Joe Biden, but I bet it’s going to be pretty close.
Hopefully he wants someone who has the mental capacity and work ethic to be actively involved, can do the job, and can run the government and military. Hopefully politics, speech cadance, looks, and rock star personality have nothing to do with the decision.