Depends on what you like, Fallout is a massive free roam game, with realistic graphics. Kingdom Hearts has exciting combat and more interactive gameplay (making up yuo're own combo's, jumping around courses etc.). Final Fantasy, turn based fighting, like watching a fantasic movie with a vibrant storyline. I still would prefer Kingdom Hearts though.
The harder the fight, the better the prize...well, hopefully.
Fallout 3
reasons- The Gameplay allows more choices, such as the story allows you to make your own choices.
The graphics are ok.
The Combat system with VATS Makes the Game just that much better.