I got both, 4000s on my 'race' wheels and gatorskins on my 'training' wheels. Since i got them, both sets around Nov last year i have had a total of 4 punctures, 3 in the gatorskins, and one on the 4000s. Both have probably done similar milage, as im not really fussed about which wheels i ride with. (I race on my Boras that are fitted with Gatroskin tubbies!) Honestly i cant say that the 4000s is a better tire just because it has has less punctures, it could have just been luck. But it certainly goes on to the rim easier than the wire beaded gatorskin, and is considerably lighter as well. The wear on the 4000s is also very good, showing very little signs of wear even after almost a year of use. If this was my ond 4000 tires, the tread would have been square and probably be in the bin already. Grip seems similar on both tires, as does cornering etc. But having said that no matter what tire you ride, hit a while line in the wet on a corner and you will slide. I prefer the look of the 4000s, just because of the all black casing, and the fact that it has a kevlar bead. But for an all purpose tire that you can race and train on, the gatorskin cant be beat in terms of price.
