I have applied to both, 4 MD and 5 DO. I have been accepted to 4 of the DO schools and havent heard back from the remaining 1 DO school and the 4 MD schools. I look at it this way, either route will be challenging, and either route will get me to my goal of being a physician. If I get into UIC or SIU it would be pretty hard to turn down because I am an Illinois resident and the tuition will be less then DMU-COM, KCUMB, CCOM, and AZCOM. I think people should view it as another option, not a back up plan. I have a classmate who is a 3rd time reapplicant and refuses to apply to DO schools. I dont get it, if you want to be a physician and the MD route isnt working for you, you should at least try the DO route and see if you get any luck there. Instead now he is going for his masters in nursing, makes no sense but whatever. I guess in a way it can be viewed as a back up, but its more of an alternate route to the same destination.
From my experience, anyone who views the DO route as inferior is either a pre-med who hasnt applied yet, or is simply full of themselves and just wants the prestige s/he feels is associated with being an MD. In the Chicago area, and im sure in many other places, tons of DO's work in the same practices as MD's. In fact when I was shadowing back at school, I remember that at the hospital near my campus there were two nuerosurgeons in a practice together...one was an MD and one was a DO.
I have heard that there is some bias toward DO's in certain residencies, but if you work as hard as you can and get good boards and do well on rotations, im sure you will end up where you want to be.