Only been on two.
Gatekeeper and Thunderbird.
Tough choice, I feel like Thunderbird is a better actual ride, like more consistent and better actual layout, but (in the back) I enjoyed Gatekeeper more. I found it had more pull/force than Thunderbird. Though front was crap, and I had some rides where it REALLY peters out over the 2nd half. In the end gotta go with just better experience, so edge to Gatekeeper, though again I grant Thunderbird may be a better coaster. Both fun, neither blew me away.
Will get on Wild Eagle this year, see how it compares. I usually hear it ranked near the bottom, but then some have it as their fav.
1. Parrot Coaster - The smart and graceful one
2. Flying Wing Coaster - The weird and intense one
3. Flug der Dämonen - The efficient and bouncy one 4. Wild Eagle - The inefficient and pretty one
5. Swarm - The inoffensive and Thorpe one