Oh, now you've started something.
Everywhere, and I recommend it ALL!
Not joking. I'm in Alabama, but Savage Gulf and Fiery Gizzard only take about 1.5hr longer to get to than Cheaha and the Pinhoti, so I actually hike more in TN than AL. In late fall through early spring, I'm up there midweek about 3x per month, and have places almost completely to myself.
Virgin Falls is a favorite, too, and Scotts Gulf/Bridgestone-Firestone Centennial Wilderness is right across the street. I take some vacation time every December to spend a week around Big South Fork, with Pickett State Park and Pogue Creek Canyon SNA right there on the east side, and Daniel Boone NF just north. The past few months I've been combining an overnighter or two at a time with quick visits to places that don't have much mileage, just to see more waterfalls(LOVE waterfalls). Frozen Head, Laurel-Snow, Fall Creek Falls, stops at Ozone Falls, Piney Falls SNA, Burgess Falls, Rock Island, stuff like that. I love the terrain, and the hiking in the whole area from the AL/TN line up into KY is just glorious. I'd be up there screwing around right now, except for covering 3 extra shifts while a guy's on vacation this week.
But I've seen most of that many times over, and have only briefly hiked on parts of the FHT, like at Table Rock SP and around Whitewater Falls, so I want to do all that. I like a lot of places in SC/NC, but only get up there once every couple of years, since it's quite a drive and I have to save vacation time for trips out West.