I completed my online apps to ASU and UA, as well as a few other out-of-state schools just recently. I've already been accepted at ASU and the application process was very efficient and organized.
I had the exact opposite experience with U of Arizona. The online app had tons of computer glitches and the admissions office was unhelpful, whether through online chat, e-mail, or phone calls. The solutions they offered to me to solve the glitch weren't logical, so eventually my parents called. They were even puzzled. After considerable trouble, we managed to finish the online app with the help of a college adviser who intervened. My close circle of friends have also had the same experience. In fact, two of us, as well as my parents, have been treated rudely over the phone and found the UA staff, both working students and employees, unknowledgeable and very confused.
I hate to make a choice on a school based on the admission office alone, but right now if I stay in state I'm leaning towards ASU for this reason, at least for now. I'd love to hear from students regarding your personal experience with ASU. Thanks.