I agree that there are officer jobs in common between AF and Army. For example both branches have cyber divisions. On the other hand you cannot fly jets in the Army, nor can you command a tank platoon in the AF.
One big difference is that AFROTC is HIGHLY focused on STEM majors, where the Army is not. Also, the AF is almost always an Active Duty commission whereas in Army ROTC, your National order of merit score (OML) dictates if you are offered active duty or Reserves/NG.
In my opinion, you really should sit down and get your grades straight first, because right now your grades are below the threshold for BOTH branches. What's going to happen if you enroll in ROTC and are suddenly required to devote a significant amount of time to PT, military training, field exercises and more? As it stands, you need to prove you can handle college without ROTC.
I would recommend you speak to your college AF or Army recruiting officer and discuss what your realistic chances are given your current GPA.