Your agreement/disagreement is based on wrong metric.
Looking at Vilas record, I find we won just 1 RG + four finals (including said win). Si I scratched my head: where those 632 clay court match wins by Vilas came from? Someone said mainly 250 level events. So, his wins, in terms of ATP points, are weighed 8 times less than Rafa's decima (soon to be deci-una as the rest of the field is looking like second class players). Other decimas/deci-unas (at least soon to be) MC, Madrid, Barcelona, are worth 4 times or two times more than most of Vilas victories. I don't even need to define and calculate the precise metric because by this overview, Rafa's 400+ (soon to be 420+) wins have much more weight (I estimate several times more) than those 632 wins.
There is no slightest doubt, that by any reasonable metric, Nadal's achievements on clay, even if his career were cut short now, are far superior than those of Vilas. And subjectively, looking how Rafa is humiliating the rest of the field now: the best players are lucky if they get away without bagel... Have you seen anything like that, not with just Vilas, but any player in ATP history? I haven't.