Ok so I've really only been to Thorpe Park and Alton Towers enough to make this list and the order changes frequently, but here goes:
1. Nemesis, Alton Towers
2. The Swarm, Thorpe Park
3. Rita, Alton Towers
4. Saw: The Ride, Thorpe Park
5. Oblivion, Alton Towers
6. Stealth, Thorpe Park
7. Air...