Playing FPS games on the hardest level can be really frustrating (except Halo 2 on Legendary). Like DOOM 3 or Half-Life 2, on a console, you just press a combination of buttons in a certain order for a cheat, on the PC you can bring up a command console and enter a code for a cheat.

Advantages:

Console games: You don't need to memorize a code, just buttons.

PC: MANY cheats available!

4 me, i would go with PC