Afterburn, easily. I love the woodies at night, but Afterburn often kicks into another gear at nighttime.
That "overdrive" gear is what takes the coaster from a strong, top 10 steel to my 2nd-favorite steel coaster anywhere. I'd get the Spring rides on TG, think it was good, ride it in the summer and think it was better. I'd go ride coasters at other parks and think "ok, this is better than TG". Then Scarowinds would come, I'd get on TG for some night rides in the crisp October air that it seems to really like, and

. It'd kick into that gear, blow me away, and re-assume it's rightful position on the list. I still like Kumba (yeah, Kumba) a slight bit more.
ERT at Coasterstock was
close, but still a bit slower than some rides I've gotten at Scarowinds.