Early this year, I saw a skit on Conan O'Brien, where he asked "
If Donald Trump were president..." , and they showed a clip of Trump's videotaped comments when he was being guest iterviewed on a radio show (Howard Stern?), and Rosie O'Donnell phoned in to chew him out in their ongoing back and forth. He really laid into her and said:
"You're fat, you're ugly, and you've never been funny..."Then O'Brien visualized in the future (still-photo visuals, with inserted moving lips on both), Trump as president, dealing with Kim Jong Il on the phone: "
You're fat, you're ugly, and you've never been funny!"

I think Bush is in better shape, but I think Trump is smarter, so I'd bet on Trump as the winner.