Well, a gamepad for a PC is fine: PC's are hardly portable, but it would be more of a hassle to lug around for something like the GBA or DS. The variety of pads for the PC is awsome though; they all rip off the SNES controller, which is easier to rip off than something like the 64 or Cube controller.
I'm hardly a PC gamer, but in my experience 3rd person games have had generally awkward controls. I've played Rayman 2 on the 64 (gotta love that game), but things like KotOR and and a few non-commercial games of the genre I've played on the PC have always been a little wierd to control.