Scourge

I like both. Generally I play single player first so I know what the hell the game is about and the story line, as well as to get use to weapons, tactics, and blah blah blah. I like to play online as well in group, most particularly multiplayer online where you have to work as a team, especially in Mech Warrior 4 Mercs where going out alone against a larger team means curtain death and a good butt kicking. But I do play single player campaigns and still have loads of fun.