CE probably has my favourite campaign (both solo and co-op), but for PvP it’s definitely Reach for me. It’s also the one I’ve got the most time in by far.

I didn’t get much into Halo 3 for some reason, I’m not sure why. Aside from the campaign, I mostly just stuck with Halo 2 until Reach came out. I was also getting into CoD a bit between playing 2 and Reach so that also sucked some time out of 3. Then after Reach I got super into Battlefield 4 and that was my main PvP without friends but with friends I still mostly played Reach until my friends moved on from it. Now I almost exclusively play single player games, with the exception of one friend who I’ll sometimes play NHL with.