Skyrush is painful. Twisted Timbers is also painful. Skyrush is better, but I can only ride it once, pretty much. But man that one ride is something else. If you're going to ride it, ride it back outside seat. It's nuts. Twisted Timbers I can ride a few times in a row before it hurts too much and ends up not fun. Personally neither of these top El Toro, which for me, at least, is also insane, but eminently reridable. I could ride El Toro non stop all day probably.
Just went on Skyrush for the first time today. My head was rattled. I know I'm probably in the minority here, but everyone I was with agreed Candymonium was a more pleasurable ride. Big plus for it being lights out and the crisp air whipping us in the face.