Can't you see what I'm quoting? I'm not talking about your last post; I'm talking about the one before that - the one people reading this topic from the start are going to see first - where you mention the PC straight off but only as being inferior for lacking a bullet point (Decay) in comparison to the PS2 port.
Yes, it's totally clear that you think the Steam version is the best! The topic title asks for the best version, and I really do think that missing out on the mods makes the other versions not worth considering if they have to be the only version played - especially since with a TV tuner and a joystick one can play it on a television anyway.
In any case, it's good of you to mention Steam as the best version; you should have put it first. I also put up a number of other useful bits of information so I don't see where you come off with your panties in a bunch.