Well from the way you talk it sounds like you are talking about halo and halo 2 campaigns, not multiplayer. I still think halo had a better campaign than halo 2. I didn't like playing as an elite, and halo 2's campaign seemed a lot harder to follow than halo's.

But when it comes to multiplayer halo wins any day. I still love playing halo multiplayer to this day, and sometimes I can't even stand playing halo 2 on xbox live or split screen with someone. It just isn't fun.