Macon is very different than Atlanta, a lot quieter. Suwanee is basically north Atlanta. So if you like quiet, macon is good. But I would choose based on how good the programs are. Atlanta is close enough to Macon that you could go most weekends for activities.
Both places are pretty safe, Suwanee is mostly single family homes and Macon it will depend on what part. I went to Tech for undergrad and that is a much worse area than either you're looking at.
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