While both Halo and Halo 2 are great games, I have to go with Resistance. The weapons are much better, the level design is FAR superior, the story is a little better (though maybe about the same as Halo 2), the single-player campaign is more fleshed-out, and the AI is better (although the Halos on Legendary difficulty is comparable).
I don't play multiplayer that much, so I can't really say which is more fun online, but I DO know that Resistance is great on the Network, just like Halo 2 is on Live. I've also gone through both Halo 2 and Resistance co-op, and my roommate and I agree that we just had more intense fun with Resistance.
Of course, it may not be a fair comparison as Resistance is a next-gen title and both Halos are last-gen...it'll be a better comparison when Halo 3 comes out, I imagine.
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