Gonna have to go with the second one. Not a big fan of the graphics or paint on either, but the yellow one is too busy IMO. Sure, they have about the same number of colors (white, black, blue vs. yellow, black, orange), but the yellow clashes with the orange, whereas blue goes nicely with both white and black.
In terms of build they're both goddamn pimp and more or less equal so I'd say it's a draw in that regard.
Yellow and Black frame with orange components. It has more variety, therefore making it more unique. Anybody can put black and white together, but if you've got black, yellow, orange, and red...definitely better IMO