Ah, the old debate. I ride both. Have tubulars on my Paramount track and my Slingshot fixie. Also have a set of tubies for my road bike (race wheels). Most of my mileage is on clinchers. That said, there is alot of magic when on the tubies. Very supple, light, and then you have the whole mystic experience when gluing a new pair up. Or maybe its just the glue smell.
Currrent Clinchers are light years (depending on the model) ahead of where they were. My Hutchison Carbon Comps with latex tubes are as close to a good set of tubies as I have yet to ride.
It's a toss up. You can buy the clinchers for ceaper and they are much easier to change in the event of a flat. If in the same position, I'd go clinchers.
Dave