Bah! Luddites. I use this now Catch up to the world people
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In all seriousness 98% of the time I choose neither and select 360 gamepad, even if it means extensive work on remapping the controls and finding the right fit through xpad.
But, in the rare occuasion when I have no other choice, it would be arrows, and having to remap the hotkeys to half the numpad the pg control keys, right controlenter, etc. For me having extensive MMO background it is illogical to cover the "chat" keys with commands. Plus I am not fond of having to either hover your hand over the keyboard or rest the palm of it on something movable such as the keyboard itself. So yeah not fond of WASD at all.