TFU, definitely. It's a console port, but the only "problem" there is is the lack of mouse support in the menus, so you must use the keyboard to navigate it. Otherwise, it's easily playable. I have a Xbox 360 controller and I much prefer the keyboard + mouse to play the game. The PC version is the Ultimate Sith Edition, and as such it comes with all DLC (levels and costumes) available.
TFU2 is short, doesn't have all the DLC like the console version, and it lacks some graphical features that are present in the console versions too. It's a bit more optimized for the PC, but it lacks too much in comparison to the console version to be worthy.