Breck usually has a wider variety of rails. Keystone's are generally variations of down rails, as mentioned above, with a few random others thrown in. That said, I like Keystone much more because of the park lift. You can watch other people hit the big features the whole time and get pumped while you're riding up the lift. Also, it allows for extremely fast laps. Both will be crowded on President's day. I think you'll have more fun at Key.