I think I liked Buttigeg and Perez the most, but my impression of them is the same after the debate that it was before: they've got the strength and appeal to run for higher state offices, and putting them in the party chair slot for four years would be something of a waste of those strengths.
Given the wide amount of support he has from progressives and establishment figures, it seems like Ellison will likely get the job, and I thought most of his responses were pretty reassuring. I'd be happy with him, Buttigeg, Perez and maybe Greene in the top gig, and just about anyone else in the vice chair slot. Overall, it seems like everyone on that stage has already been able to diagnose the party's problems and knows how to fix them, which is good news.