I have only used the Kennetreks for a couple years and have no complaints, but you hear stories about guys having OR Crocs from the 80s that are still truckin'. That's probably what I'd go with if I were you!
I have the Kennetreks and a few pairs of Outdoor Verglas (picked them up for $19 each at Cabelas two years ago). The Verglas are slightly lighter than the Crocs (I think they use Pertex and 500D cordura vs Goretex and 1000D), but I haven’t noticed the difference in use. So if you find a steal on them, grab whatever you can. Both are built well