Sorry, but the controls of RE5 are AWFUL. Neither of them is an horror game, strictly speaking (try RE2), but l4d is a good co-op survival game - incidentally using the mouse to point is way easier than keyboard or joypad -.
i like RE5 better because it has a better story line than L4D plus they through just as many enemies at you as L4D at times and make it more difficult than swinging and ax at them and killing them in one hit.
yeah L4D2 kills RE5.. resident evil5 isnt even zombies its just crazy black people running around and occasionally a random buff dude.. but on L4D2 THEYRE ACTUALLY ZOMBIES!! so yeah. RE5. get raped.