I use 1/8" or 3/32" (I can't remember) Crystalyne from Yale, bought from Annapolis Performance Sailing. I have it because I was able to get about 200' feet of it really cheap, something like less than half its regular price. It was a cut length leftover and I bought it during their crodage sale, which apparently happens every February.
I like it. It's probably too thin for many uses, but I can carry a lot of it with very little weight. I purposely carry too much of it in case I have to double it up for extra strength. Probably not the most efficient thing to do, but I mainly canoe camp rather than hike, so an extra pound or two is no big deal.