To be honest, anywhere in the Atlanta area is producing high levels of traffic at most times of the day. Like others said, just going from one end of a satellite city, (i.e. Marietta, Acworth, Woodstock, Roswell, etc.) to the other can take upwards of 30 mins sometimes. Your best bet is to accept the fact that you will be commuting since you both work in different cities. If I had to pick I would go with the north eastern part of Marietta as to me that is the closest equal distance travel times. That said, you will be in a higher price point to live there these days.