Hospital choice??
I used Emory Dunwoody. It was fabulous. It's smaller than Northside and has it's own private wing for Bariatric patients. It was nice to walk around (since you have to) with other patients and not be to self-conscious.
Also, it has all private rooms and all the equipment is specifically for bariatric patients (the beds move to a sitting position so it's very easy to get in and out of).
I haven't been to Northside, but I loved Emory Dunwoody - the parking was no problem at all - could park right up front, and they have very liberal visiting hours with a couch/cot for a family member or friend to sleep over.
The staff was very nice and responsive.