The curricilum is different at the two schools. ASDOH is modular while MWU is a system based/integrated approach. MWU has a larger student population on campus due to the handful of health professions programs. MWU also has full-time science faculty where ASDOH hires science faculty to fly in to teach their respective modules for segments lasting a week or so. ASDOH's dental class sizes are about half of what MWU's are.
MWU gets the D1's in the sim lab every week for waxing and clinical projects where ASDOH D1s don't as much. MWU is probably a little closer to downtown Phoenix and Scottsdale, ASDOH is probably closer to Tempe. ASDOH is in a more suburban environment while MWU is in a little bit more of an industrial part of town. Both campuses are beautiful. You won't get in trouble for walking on the grass at MWU

. Both schools take boards part I after 1st year. I think both schools try to create diverse classes so the students come from all different walks of life. I think the biggest difference is the emphasis on public health at ASDOH. You are required to get a certificate of public health at ASDOH with the option to get a masters.
If you get into both schools, you can't make a wrong choice either way in my opinion.