The clearness, yes...I've never tried polyclar. I've always used Irish moss and had hit-and-miss luck with it being clear coming out of the bottle, but kegging comes out beautifully. I have yet to figure out why you don't get the same chill haze out of a keg since that's supposed to some from proteins in the beer and I don't think they settle, do they?
I also found "speed chilling" a bottle in the freezer would pour clear for some reason, but the same beer left in the fridge for a few hours would cloud up. Weird.