The rentals at Los Angeles also all have clinchers and they work fine. I occasionally train with clinchers, and have raced with them a few times on concrete tracks, but I like the handling of tubulars. For me I think it's mostly about the consistency of handling at all speeds and locations of the track-- riding madisons you ride all different parts of the track at speeds from 16 to almost 40 mph (or faster if you're better...). Clinchers tend to have a less round cross-section and feel very different at low speed.