Who Would Win?

Master Cheif

yes and I'm an expert on halo

I used to have an Xbox
But my Xbox broke and I have a PS4 now
But I might get an Xbox one for my birthday in October

I'm saying that the Primaris Marine will win, because it has a gun that shoots bullets that are pretty much just rockets. Plus, a Primaris marine is very fast, even in it's armor, and in it's armor, a Primaris is about 8 Feet tall.

Also, I don't know much about Halo except for somethings like the Flood (not sure if that's correct), the Elites, Planet Crackers, master chief, ringworlds, Cortona, and Spartans.