Hmmm, this is a tough one. I've always thought that Piraten looks like a really good coaster so that gets my first vote. Then it is between Khan and Fenix for me. The former is a great old shcool B&M which is really quite intense and the latter is one of the better Wing Coasters, albeit a tad short.
My heart says Fenix, but my head says Khan. And in this case, my head has won.