well, as a current owner of a pro 4, evo 3 and 4, 415, 414, Xray evo2, and a couple of cudas...
i do like the Xray, but the lack of fine adjustments of the rollcenters surprises me... you can only use the holes predrilled in the chassis. by using the other manufacturers setup, they are infinitely adjustable by however small shim you use.
granted, i dont think that i can fully utilize all the benefits...!
they are all excellent cars, fully capable of winning. i wouldnt say that any car is necessarily above or below, just drive what YOU like, and let 'em all eat cake...