Which is more violent battlefield or halo?

Battlefield because halo you shoot aliens and not stab people in the necks or any that stuff. Halo should be rated M because the flood and blood language. But If someone that's playing halo and their 10 they won't get that violent. Battlefield with because are simply killing People which may make you violent. So If your a parent, don't be stupid and let your kids play people killing people, in less if your kid is like 14 but not like 10.