There seem to be three distinct levels of boats (can I say that among all the experts around and not get pelted?)
First, the recreational, big-weight carrying capacity. Second, the moderate performance boats with more power and less load capacity. Third, all the high performance boats. Some overlap.
Lots of factors to compare but for moderate to heavy wind conditions, more comfort on the moderate performance boats in those winds -- especially for solo sailing. Plus better agility in lighter winds.
Yes, do take all this with more than a grain of salt. I live to be heckled. Heckle away!
There are basically two types with many different materials depending mainly on purpose and cost. For example the wave is molded plastic while the 450 is fibre glass and the 500 is fiber glass with foam core.<img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />