Absolutely would look at Sun Dial for your brunch. Night is pretty with lights but really not a view. I don't believe they have turned the rotating floor back on

but am sure you can walk around to check out views after you eat.
https://www.sundialrestaurant.com/
If you will have an evening I would suggest Polaris Lounge on top of the Regency Hyatt. Great apps and while totally renovated it is a part of Atlanta history.
https://www.facebook.com/PolarisAtlanta/
Trader Vics in the Hilton, very cool unique spot been there forever.
https://tradervics.com/locations/atlanta/
Pitty Pats Porch is an icon, southern cooking. It's old, not really had any kind of renovations in decades. It fits the theme as if it's an old home but not everyone is prepared for how basic it is, like kinda musty old best I can describe. Not cheap either for type of food but it's good.
https://www.pittypatsrestaurant.com/
A really good icon of southern cooking - need uber is Mary Mac's Tea Room. I would pick it over Pitty Pat's. It's right on the way to Ponce City if you want a good meal then go on to Ponce for exploring.
https://www.marymacs.com/