I'd like to see them race rather than a tug-o-war. I wouldn't even consider buying a 2 stroke ski these days. If you have the money definitely get the VXR. Guys are reporting top speeds of 68 mph on the VXR without mods. The 4 stroke will out last the 2 stroke mayby 2 or 3 times as many hours, and you don't have to mess with 2 stroke oil, worry about pump failure, etc.. Plus I'd guess the VXR is much better on fuel (the GP1300 was a well known fuel hog).