Halo vs. Call of Duty

I decided to take a break from blogging about movies for a while, primarily because I'm not getting any views and also because there have been some interesting conversations I've been having with various people about comparing different video games.
Halo vs. Call of Duty... so many people have thought about this, so many people have just formulated their biased opinion on this subject without much thought, and when you confront these people, they claim that they know what they're talking about. It's really quite frustrating.
I'll try not to give my biased opinion on the subject as much as I can, but if I start seeming to bash a certain side, please excuse me.
Many people say say Halo was a victim to commercialism, that it was one of those games that was famous for being famous. Many others also think that Call of Duty only got its glory because of the fact that it was released after Halo and people started getting sick of Halo so they just started playing Call of Duty. All of those are superficial reasons that distract from the true problem here. Call of Duty, while it has lots of similarities to the Halos, is a fundamentally different game. Fundamentally different game. You can't compare them, you can't compare them because they are first person shooters. That's like comparing apples to oranges because they are fruits, as cliche and lame as that sounds, its the brutal truth.
I've had people come up to me and tell me that Call of Duty is much better because there aren't any vehicles, or that the physics are more realistic. I've had people insist that the reason Halo was better than CoD was because its harder to kill someone in a one on one format in Halo, therefore there is more skill required to compete as an individual. Let me break it down for everyone here, CoD is primarily a team- based shooter, with less emphasis on the individual and more on accomplishing the task at hand. You do this through careful planning and coordination with your teammates using terrain, and things like "air raids" to your advantage. Halo has less focus on team play, seeing as how you can only host sixteen players in a server, and it is considerably harder to kill someone. In CoD, if you get ambushed, there is a 99.99% you will die. It has nothing to do with the skill level of both players. It just is like that. In Halo, fights can last several seconds. Weapons are all the same, there is no ways in which to upgrade weapons or upgrade your character in anyway as opposed to CoD.