Call of Duty - I care not for the setting, guns or vehicles. I just prefer the fast-paced plays, map-knowledge dependence and being able to base my performance on my own skill rather than depend on team-mates co-operation most of the time.
And I'm waiting for the rant you're about to throw towards me purely because I prefer CoD. If you're going to post a topic like this, search through existing threads and put at least some effort into an un-biased and thought-provoking topic rather than "Halo vs CoD: Halo is better because I like it more than CoD. Also CoD is bad because I don't like it. Xbox is better than PS3 because Halo is an Xbox exclusive and because I like Halo." You even said "I'd like to hear your opinion on whether Halo is better than CoD". Have you ever posted on a forum before?