The Army isn't a good career move, and being a grunt isn't going to get you a lot of jobs in the civilian world. If you want to sign up for an infantry MOS, you might as well go with the Marines. It's harder, but there's more prestige and camaraderie among the devil dogs. I know from personal experience.
But career wise, go Air Force. And study up on the ASVAB. It's almost like a college placement exam, and the higher you score, the more options you'll have available to you.
My younger brother signed up for the Marines and he's going to Parris Island in April/May. He's excited, and all he's been doing is studying and getting his cardio up.