Not a lot of change in Atlanta traffic. Back to mostly normal now that the I-85 fiasco has been repaired. Each to his own, but 285 can be more dangerous and/or aggravating than going straight through. Lanes are narrower and speeds great, not to mention the trucks.
I might just stay on I-75 and go straight through, paying attention to the signs when you get on the 75/85 'Downtown Connector'. When 75 northbound bears slightly to west you will be OK until you get past 285. It gets a little heavier because of the new baseball stadium and the construction going on with the dual use roadway being built. Saying all that to say, pick a time between 10 and 2 during the day or after midnight at night and head through. You will be fine. Thousands do it every day