My heart belongs to Vinny but in terms of just pure entertainment value it has to be Jeff.
True that. The only problem with Vinny is he has moments that exceed the hilarity of the rest of the crew combined, but he's the man behind the machine. So he doesn't have the time to appear on camera that much. Sometimes he doesn't even make the podcast (like last week). But the man that is consistent with a high level of hilarity is Jeff. Ryan and Brad have their moments that, frankly, are few and far between. They're better at other things.
tl;dr version: Vinny is better than all, but Jeff is consistently on camera. I chose Jeff.
I love Vinny. He's just the most likable guy on the crew. Jeff, while frequently hilarious, is often too cynical for my tastes.
As a sidebar comment, I don't think Brad or Ryan get enough credit for what they do. Brad easily gives the best interviews of anyone on the site, and I don't know where the Bombcast would be without Ryan, who is very charismatic and does an excellent job of being the mediator when the need arises.
Also, Patrick should be on this poll.
Why isn't Patrick on this list? I know he's the new guy and all, but I actually find him really entertaining.
But yo, Jeff did that Nintendownload Xpress with the Ricker, which was probably one of the funniest video game related things to ever happen. Brad and Ryan are pretty great, but I think they're better suited for a more sober critique rather than the sometimes outright satire that Jeff will do. Vinny is usually entertaining when he isn't talking about video games, and doesn't have as many appearances on the site next to the rest of the guys.
Vinny and then Ryan. Shouldn't Patrick have been an option and maybe even Alex as well, to be honest Alex's articles are some of the best around he really puts his personality into them and makes them even things I have read already three times on different sites interesting.