I don't think there is a huge difference between DO's and MD's. Classes taken in school will be exactly the same with the addition of OMM classes in DO school. There are some differences in philosophy, but all in all, they are the same (both are physicians). If you go to the AOA (American Osteopathic Association) website, I think they give a pretty good, nonbiased, explanation of the differences.
Each has full, medical practice rights, is able to practice the full spectrum of medicine and is paid equally. As far as one being regarded as more superior, I think that is a matter of opinion. I have met MD's who think they are superior to DO's, DO's who think they are superior to MD's, surgeons who think they are superior to family physicians, and Ivy League graduates who think they are superior to state school graduates. Don't let this be your driving force--superiority is childish.