As DanTnz said above, the A's have a better sail area to weight ratio upwind. But I have done better vs. sloops in more wind, not less. I think in very light air a light sloop crew does better because of the jib. In heavier air, once the light sloop crew has to depower, then the Uni guys can stay with them, upwind, usually.

BUT...what then happens is the sloop crews kick butt at the spinnaker set and more so on the douse, as the skipper can keep driving fast while the crew does all the spinny work.

I am not ready to throw in the towel on racing Uni, I enjoy the challenge of doing it, all by myself.