Personally, in marginal conditions, I'm not too much interested in speed but rahter in early planing.
But I reckon that the Ray could have a bit higher top speed.
A downwind slalom race with a few jibes around some buoys and I think the US147 will win again.
In figure-8 races or other races with some serious upwind racks, definitely the US.
IS87 / IS101 / IS122 / US147