I seriously think PS2 version, because it\'s going to have much more extras, and a cooperative multiplayer action!
I mean... the PC version just CAN\'T be the best, if not counting up Counter-Strike, wich is VERY enjoyable as a multiplayer game.
I hope Half-Life for PS2 will have Counter-Strikey extras where you could take role of a soldier ( maybe with your friend ) and take on heaps of other soldiers / aliens; and you work as a team... wow it\'d be cool.
DC-version can\'t really be better either because Sierra saves something extraordinary to PS2-version as they push the launch-day further... and they\'ve said the PS2-version will be the best and really "bring" out the Half-Life...