Sorry man, I don't know much about bikes, but I would say that green one looks more stacked than the red.
First. Edit: The exhaust on the second looks sick. Edit Edit: If you did the paint on the second, well done.
What kind of bike is the red one? based on looks, if you were to put some decals on the red one and make it look sweeter Id go for that one. Not a big fan of ninjas, I'm a GSX-R guy myself.
Ive got a F3 myself. I love my bike. Its my first one, and im gonna keep it for a while. its pretty rare. Although im partical to the kawi. The only thing i dont like about the older cbr's is the OEM rectifiers are junk pretty much. both bikes have nice exhaust. that muzzy looks expensive, and that shorty on that F2 is nice.