OBs - those who practice OB/GYn, not family practice, are surgeons. Family practice docs, when surgery is needed, can usually assist in surgery, but typically they do not DO the main surgery (though some do). Also, GP/FPs do not deal with High risk / surgical clients - and they are often overseen by OBs in complicated births.
Family Practice docs have a tendency to not have the "waiting for danger" to happen when it comes to birth and pediatrics. It's why I think that most people, if wanting to see an MD, should see a FP/GP rather than a specialist. It seems that OBs on average are OBs because they are MDs that LOVE surgery, not necessarily because they have a high regard for the sacredness of birth and women.
That said, I'd never throw the baby out with the bathwater just because of one experience with a CNM that you didn't like. Sadly, most CNMs practice the way they do because of the OBs that "set the rules" and oversee them. Whereas, for some reason GPs/FPs are more independent until something goes out of the scope of normal, in which case they then consult with an OB.
The key here is to NEVER really go just with the credentials - but interview EVERYONE and ask blunt, to the point questions (and not accept "well, I don't usually, but .... ") that matter to you. With malpractice insurance, any insured provider is going to be more quick to intervene and less likely to sit on their hands. Sadly, this also goes for many homebirth (non-nurse) midwives. We live in a culture of fear around birth and nobody, it seems, is immune.