: My $0.02.

Well, if we did stick with one game I'd vote Reach simply because it will always have more content and more variety of content. There's a lot of Invasion, Infection, and Race content that we quite simply cannot replicate in Halo 4 because of the lack of gametypes & custom options (and even though Forge Island is an improvement over the on-disc Forge maps, it's no substitute for Forge World). It's the one reason I insisted that we alternate between the two.