I had a birth with North Fulton back in 2007 (when Margaret was still with the practice) and a subsequent birth with Intown this past February. My experience with Intown was much better than my experience with North Fulton. I believe the main difference is that North Fulton is mainly an OB practice, where the midwives were "allowed" to treat patients. At Intown the whole practice is basically midwives. There is a supervising OB, but he is incredibly hands off and has his own practice going off site. Therefore there isn't an OB office culture to deal with during visits.
I will say that North Fulton hospital rooms looks nicer than Atlanta Medical's rooms (which looks like they are straight from a mental hospital, truth be told) BUT my experience with the nursing staff at Atlanta Medical was vastly superior to my experiences at North Fulton. Also, I think that for your best chance you will have for an unmedicated, least invasive HOSPITAL birthyou need to be with Margaret's practice. Not sure what the current culture is at North Fulton, but I will say my experiences with the OBs there was...not good. I really prefer to not see or hear from an OB during my pregnancy and birth unless it is absolutely necessary. I think in 2007, the OBs had a tough time letting go completely and it created some tension and made the midwives feel pressured in a way that went against what they might have done without the OBs breathing down their necks.
All of that being said, if you are used to home birth experience, you should probably try to go that route again. I didn't really get warm fuzzies from Intown (the practice is really just too busy for that) and during labor the midwife will pop in to check on you, but really isn't there to support like she would be for a home birth (of course you can get an excellent doula to help bridge the gap there). Also, by doing a home birth you will not have to deal with the annoying medical things that go along with being in a hospital (people trying to take your blood, people wanting to give you an IV, people taking your blood pressure every 2 hours, etc.).
Hopefully that gives you something concrete to go on. Congrats on your pregnancy!