Dreamashlee Hey there, can I ask if you interviewed?
But congrats, you have a pretty awesome decision to make, but they're two very different schools / programs.
USC is more of a broad program, where if you want to direct AND dp, you can do that there. You don't need a background in film to attend USC. You'll learn everything from the ground up.
AFI is more focused, and you'll only be able to DP while there. You also need a film background to attend...they don't let anyone in who doesn't have any film experience (undergrad, professional) - so think of it more as a finishing school.
So yeah, it all depends on you and what you want to do - best of luck!
filmluv - I called as well and had the same answer, although they didn't tell me about the April 14th deadline...so thanks for that!