I did the Suwanee to downtown commute for 13 years, it's not for the faint of heart. I would think Ptree City would be the better of those two options. Ptree City is much better for access to the airport too. But, have you thought about Douglasville? There are great neighborhoods just 18 miles from downtown Atlanta. And, if downtown is where you need to drive to, you'll make that commute on I-20 and that's quite a breeze in the mornings with afternoons being even better. Most afternoons, I am home in 20-30 minutes from downtown. One community in particular is Tributary, Earthcraft homes, Craftsman construction, front porches, unmatched amenities, onsite restaurant, community events every week, pools, tennis, community gym, an amazing place to live! I have a few listings there and would love to show them to you.