Mercenaries 2 is coming out on PS3, 360 and PS2. Also it's been delayed to 08.
Second, the PS3 list is missing the two biggest action games on the console, uncharted and Heavenly Sword.
And third, Jericho should not be considered action at all, it's a first person FPS/Survival Horror.
Battalion Wars I wouldn't consider action either but that's debatable.
Anyway, 360 and PS3 sharing a lot of games so based on good exclusives:
360 has Ace Combat 6 (air combat game, action?)
PS3 has Heavenly Sword and Uncharted.
PS3 wins, 360 second and Wii 3rd.