IMO, when it comes down to it the Aaron from Gas Monkey built an awesome bike, and did it in an old school style that sort of reminds me of something Indian Larry would have built. The bike is beautiful for the limited means they had to build it.
Jesse James is well an arrogant jerk. He may be talented, but he should be disqualified based on not meeting the deadline. Besides he even said he isn't winning anything. So he doesn't care. He's the "benchmark" for all the other builders.
Senior... well as CougarGuy mentioned, didn't build squat. His team did. And though I like the ingenuity that went into the bike something about the massive chunk of aluminum for a front fork bothers me visually.
Junior... ahh, well he built pretty much the same old style he usually does. He just used different trinkets this time. Not a fan of the bike. The 39 Chevy grille is unappealing to me and the matte black paint with pin stripes just shows a paint scheme that has already been done to death.
I voted for Gas Monkey FWIW