Shockwave is too rough, after standing in a queue, I don't want to be standing up with 4Gs and having my arm destroyed on the Zero G roll and Corkscrews. I want to lay down and feel like I'm flying. Put out my arms and close my eyes so I feel like a happy bird. Air is nice to relax on as you can just lay down and the design bends your knees which I find feels good after standing for half an hour.
Haven't ridden Shockwave so I know this will sound biased but I'm going to say Air. Shockwave looks a bit dull and theres not much to it. And, after seeing other Stand-ups it looks really plain and I hate corkscrews and zero-g rolls anyway, and loops are pretty dull usually.
Air, although tame and short offers a sensation of flight, freedom and tranquility that I have never experienced on a ride before. Its no way near as good as Oblivion or Nemesis but I think I would prefer it to Shockwave.
Flying coasters have not yet reached their full potential and stand up coasters are long gone now. What is it 7 years since they last built one. I hope europe gets another flyer with new elements like the pretzel loop and other new inversions to the flying coaster.
I like both of them.
Air is very smooth, fun, nice experience, but too dull. Shockwave is a bit exciting, the stand-up position is cool, and yeah it's short, but I think that what it offers, 'the inversions', are really good and fun, besides that I didn't find Shockwave rough almost at all (maybe because, I've only been on it and Air twice).