Yeah, I think most of us would agree that Phoenix is objectively the best coaster at the park. It's not even a competition.
Impulse is alright, on par with a typical Gerstlauer. Flying Turns is interesting and unique but lacks in thrills. Twister is pretty rough. That leaves Black Diamond which is more of a dark ride and then the kiddie cred.
Actually, besides Phoenix, the best ride in the park are the Flyers. <3