I prefer the Princeton Review's "Complete Book of Medical Schools." It has the same information as the MSAR for MD schools, but also has that same information including stats for DO schools. In addition, it has some helpful information for premeds on every aspect of the application process.
There is an even more in depth analysis if you suscribe to US News because you get all the information on medical schools, MD and DO. They not only give you stats, they give you the % of graduates that get into their top choice of residency. They also have statistics on the number of people each school interviews, and the number that are accepted from those who interview. This information is almost for every school, and it only costs $10 for the online edition.