Really it kind of depends on what you want. Do you have kids? What kind of neighborhood do you want? Do you want to drive to the airport or take the train? I lived in a few places on the south side and used my cousin's basement on the north side near Roswell as a crash pad when I commuted.
One of the things to watch for if you kids like the outdoors are neighborhoods with sidewalks. There are not many in the Atlanta area. As a matter of fact when I lived on the south side in Hampton we quickly found out that our neighborhood was a slam/click neighborhood. People went into their houses, slammed their doors, clicked the locks, and you never saw them. When I asked at a town hall meeting about bike paths and side walks they made it clear they did not want them. As a matter of fact, if you lived in a neighborhood across from a school you were expected to drive you kids to school as there were no cross walks.
Peachtree City was the opposite. The city decided years ago to make it pedestrian friendly and built golf cart paths connecting all the neighborhoods, schools and shopping areas. There are tunnels or bridges over the major roads. When we lived there we would ride our bikes all the time, go to the parks, walk/ride to the pizza place. In one year there we made more friends than in 3 years in Hampton. Disadvantage (in my eyes), was the metro did not go to the south side so you had to drive to the airport. Driving in Atlanta... the traffic can be really bad. It's a hub for commercial traffic traveling inland from ports and visa versa. It seemed like a family was whiped out by a tractor trailer rig once a month. The city was not too smart about stuff as well- such as sending a street cleaner onto GA-400 during rush hour. I mean you've GOT to be kidding me.
North side was also pretty nice.
As you've probably gathered there are a number of nice areas in the ATL area to live and it all depends on what you like. I liked Peachtree City, but I know others who did not like having so many people around and prefered living in the country. You might want to see if you can rent a place for a year, maybe a townhouse, then spend the year looking around and talking to people. See what you like.