Halo 4 imo. If you disagree then you weren't very good at h1,2,3. And reach is more of a halo game than H4 is. If you were good at h2andh3 you'll understand why.
You were fine with your opinion until you decided to insult anyone who disagreed. Nice going. --- "I can't believe how childish you are, both in attitude AND breast size!" - Kusanagi to Momiji, _Blue Seed_