If Warzone was included, Halo 5 hands down. Other than that, I would say Halo: Reach and then Halo 2.

Spartan J029
ODST - Bronze
I breathe and bleed Halo.
479th player to obtain SR 152. 1 of only 2 SR 152s in New Mexico.
Highest win streak in Infection: 20 games
Most kills in an Infection game: 86
Killionaires: 98
The Cures: 36
Ancient Ones: 20
Lord of the Flies: 20
78 Members
Est. 10/19/2015
Made your first hot drop into HaloWaypoint.com
Halo 5: Guardians MP Beta participant.
View your Service Record on the web.
Become a member of an active Spartan Company.