I'm not commenting to dig at anyone, but until you witness air suspension for yourself you cant really judge.
Its so much more comfortable and practical than coils, and i personally think it handles just as well. Accuair done a test, they had that black a4 in the video against a white s4 ( same car) on the best rated coilovers going round a track, and the audi with the air suspension performed just as well as the one with coils.
Its my personal opinion but until you witness it you cant judge.