Glendale isn't "warm", it's burning hot. Averages of 105 degrees in the summer. But then again, I hate the heat and I love cold, snowy weather. Having lived in a desert climate most of my life, I'm happy to get out. Of course, this is very much based on your preference, and considering they are at opposite ends of the spectrum, weather/location is a pretty easy deciding factor here.
Both are good. Both are also expensive.
You want to be in the west coast or east coast? Hot or Cold weather?
I would choose rowan but it is 3k more (58 I believe). I didn't apply to rowan due to cost.
Rowan is 57k and AZCOM is 58k. AZCOM's tuition increases quite a lot every year because they keep expanding (for example, a new veterinary program started either this school year or will start next year). However, cost of living is cheaper in Arizona. How this counterbalances their tuition increases, I'm not sure, but in 2012 tuition was 52k (if I'm not mistaken). It's now 58k. That's a pretty sharp increase, and there's no indication that it will plateau. Their web site says tuition typically increases 4% to 7% per year. Even if it's just 4%, tuition will be close to 70k during your 4th year there.
Neither has mandatory classes that are out of the ordinary (OMM, labs), both are expensive, both are known for getting students into good residencies. Rowan has better OPTI, I believe. AZCOM's class size is larger (by about 100 students) and has about 10 graduate programs on campus, so it's huge. Rowan's campus is only for the medical school. AZCOM seems to have better/newer facilities. I was accepted to both, liked both, and chose Rowan. As mentioned, I like cold, snowy winters and hate the hot, hot, HOT summers of the Western deserts, and I've been wanting to move to the east coast for a long time. Smaller class size and seemingly better clinical rotations were also big factors for me.