The Ultimate I would say is my first choice as far as all-out aerobatics, but the Skybolt is almost as capable of doing the same. The Ultimate will wind up so tight into a ke-spin that you think it will destroy itself. I can't get the Skybolt to do that.
The Skybolt is more easy to transport. It fits into my SUV where the Ultimate requires a trailor. I don't like having to assemble and dis-assemble the Ultimate. So, I can't really consider one over the other.
I usually take them both to the field in the trailor and have a "BIPEDAY"