Mark,
not sure how they will play out in the market, but I can tell you that the price point/work required to build difference makes the round bilge one maybe 3 times harder to sell...is for that reason why I did 2 designs....at the very least, the hard chine one will see at least a few more built :-)
As for performance, none sailing yet but my VPP (which often lies to me <grin>) says that the performance gain for the round bilge one is about 5-6% uphill and about 8% downhill, but you have to remember that its basically a scaled down A-boat and hence a lot more slippery.
Cheers
RG