Xbox 360 Best First Person Shooter

Well, I can tell you hands down, my husband's favorite is Call of Duty, lol. (Even though he rushed out and bought Modern Warfare 3 the day it came out, his favorite Call of Duty is still Black Ops.) My favorite, on the other hand, is the Halo series. I like the environment and the weapons in Halo more than the CoD games.
I also think that Black Ops may be better. I just got Gears 3, and it is like a mix of halo and call of duty. Have you played the Halo Anniversary? Good to have those original maps back.