Pretty sure Jakizle and I made the same exact post at the same time so chose which one you want to read
Eh. That's a hard one. I've been to neither, but looking from your point of view I would still probably pick Dollywood. Mystery Mine, Thunderhead, Tornado, Blazing Fury I guess; they all look just amazing in one way or more.
SFOG really only has two woodies and both are older classics. Which still would be amazing in themselves, but wouldn't compare to Thunderhead. SFOG obviously has Goliath, Batman, Superman, and I guess Ninja and Mindbender can be included in the steels.
Even with SFOG's heading in steel coasters I still think Dollywood would be a more thoroughly impressive experience.
Go with Dollywood, seriously. Tornado and Thunderhead would be enough for me to chose, personally, but IDK! It only depends on what you alone prefer.