I used to be an arrow keys and numpad person however I switched to WASD due to the funcitonality with games becoming more and more complex (having more abilities, needing to use more keys and modifiers). I do like the fact that the WASD method has the notch/dot on the F key so I can feel for it when I have been moving my hand around for whatever reason. I do tend to move with my mouse though as well a lot, especially when swimming.