you'll find people that wont ride anything but tubulars, and those that prefer clinchers.
with that said, i ride clinchers. milwaukee's streets are disgusting and i have no desire to carry an extra tub with me everywhere i ride. i am thinking of one day putting a pair of tubulars together for the track, but that's the only place i'll be riding them.
the weight advantage of tubulars are minimal, until you get to the 80/90 dollar tubs that tufo offers (which can get as low as 115g). their main advantage is being able to hold super high pressures (only of any use on the track) and the suppleness that some say they offer.