We go right through on 75.
We plan the trip so we hit Atlanta on a Sunday morning and, so far, we have not had real issues going through.
Have had a bunch of travelers tell us not to use the bypasses due to traffic and accidents being frequent.
There is a new park, Winding Waters, just north of Atlanta right off 75 we will be staying at this trip. We also stay at the Loves RV stop in Cordele - nice pull throughs and just off the highway.
The other place we stay is OH Kentucky which is further north. Nice place for an overnight stay and just off 75.
If you are going south through Cincinnati, I’d recommend taking the bypass before you get there (275). Adds a little distance but much nicer than going through downtown and merges with 71 / 75 south of Cincinnati.