What is your favorite Halo ?
and why ? 
Reach, because it had everything. Theater that worked in all modes, the greatest amount of custom options, the best campaign structure of any Halo, and more. Yeah, there were some mistakes in the multiplayer department, but Reach is the most complete Halo game released so far and a strong example of what the series should aspire to.
Halo Reach because of the amount of fun i had with friends.
halo 4 and reach
Halo 4 for multiplayer. Reach for all around awesomeness. ODST for story.
As of right now, Halo 5: Guardians. Yes, I know that it isn’t even out yet, but the multiplayer beta was unbelievably fun for me and I think that the campaign is going to be epic beyond belief.
Halo 3 for memories. Reach as an actual, refined game.
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> As of right now, Halo 5: Guardians. Yes, I know that it isn’t even out yet, but the multiplayer beta was unbelievably fun for me and I think that the campaign is going to be epic beyond belief.
I’m with you, I can tell Halo 5 will be awesome, so excited for it. But as for released Halo games I’d say Halo CE, it’s the one I always come back to and it’s what introduced me to the series.
halo 3 because it was when I started to get into mlg and was the first halo I beat on ledgendary.And there`s a bunch of old memories.
Nice ! Continue 
While I love the old classic multiplayer from CE, the Reach multiplayer definitely feels very full and complete. I haven’t played much of Halo 4, but it seems very fun; only time will tell if it is better.
I still play Halo Reach and Wars to this day; daily!