What are your goals further in life? I would join the Air force is you plan on having a civlian career later, if you want to make the military your career you should join the Army. Air force is great because almost all jobs translate directly to civ jobs, but Army is a better option if you want to stay in forever in my opinion. I have been enlisted in the Army for 5 years now, and I like it. If you get an intel job, you will be set for life, even as a civilian. Army taught me Russian, interrogation, spy techniquues, and gave me a top secret clearance. I can go and make 150k a year in afghanistan as a contractor if I want.
Basic is a joke for both air force and army, marines are the only ones who have a truly rough time. I went through OSUT (combat arms basic/ait) 5 years ago, before they overhauled the program and it was hard as hell, nowadays they cant even swear at you I hear.
Also, I don't know about the Air force, but the army has a student loan repayment program, which is the best way to get money for school. They will basically pay off all your loans. I wish I had gotten a Master's in something instead of enlisting out of high school, because the loan repayment is sweet, and you can only get it on initial enlistment. well I have to go to gym so Ill check in later