Halo 3: Custom maps can last you forever (race tracks for example), Lots of different game modes/playlists, Theatre mode for making videos, taking screenshots.
Mw2: Amazing campaign, good online (although, im not a fan of it, its full of campers, glitches, overpriced map packs ect).
I prefer halo 3, i've had over 1500 matches in total.
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