Both are fine cameras. More important: which one feels & handles best in your hands?
I have an F and an F2, and they're very similar in a lot of ways, obviously, but the slightly more rounded shape of the F2 for me wins out. The small improvements--the higher shutter speed, the hinged back--mean that most of the time when I want one of my Nikons, I choose the F2 over the F. Mine has the photomic head, but the meter no longer works right, so it might just as well be a plain prism. I've only shot wit an F3 once or twice. I'm sure it's fine but I like the more completely mechanical models.