sorry i don't want to create a argue between both side however i am having a hard time deciding which to buy. I have got a pc with quad core and ati hd 5850. Will i regret buying the pc version. (will their be a lot of people playing on pc)

i need some answer

You need to make your own decision. I have no idea how many players in Thailand plays on Xbox 360 or PC.

I assume the connection from Thailand to America or Europe ain't that good? Bad connection will just hurt you in multiplayer

Buy it for the PC. PC games always play better, look better, and are generally, better.

i have seen that pc produce a better looking and i am very satisfied however will they be a lot of people playing around the world as much as xbox 360. I would also like to know if my rig will be enough to handle the game

Well tell us the rest of your rig.

What is most compfortable for you?
In my opinion a controller is most compfortable, but as I said, that's MY opinion

I play it on a Pc

PC, definitely

PC. The XBOX360 version runs at a combination settings of medium (textures) low (draw distance) and customized high (short range shadows/lighting). There is a LOT of pop-in on the XBOX360 version that breaks immersion and destroys the gameplay experience.

My friend was playing the XBOX360 version and was trying to shoot a C.E.L.L. operative at long range by firing through his reflex sights. He kept shooting him, but he wouldn't die, wouldn't even take damage. So he switched to Assault scope (longer range) and zoomed in. All of a sudden, a wall appeared that the C.E.L.L. operative was hiding behind.

Do you really want to spend $70 USD for a console game like that?