I assume that the fabric for the XLC is the same used with the BB, which I own in both versions. However, while the 1.7 fabric hasn't changed over the years, the 1.1 fabric has. I had a 1.1 Traveler hammock which was super silky. I loved that fabric. I also had a black 1.1 Blackbird, wheren the fabric was not as soft. The brown 1.1 Blackbird (ordered last summer) I own now is a lot less soft. It hasn't been much of an issue in the daily use, though.
If it wasn't for the extra weight, I would prefer the lay of the 1.7 fabric. It is more coarse, but it provides more support (and I'm only ~135lbs). I found that I prefer the firmer lay that the heavier nylons provide - not just with WB. So if you already have tried hammocks with different fabrics, it should give you an indication as to which option would suit you better. For hiking, I take the lighter hammock anytime. The difference in comfort is very small - but I definitely prefer to haul less weight