I had Giles slings on two ARs, & they are great slings. Very durable, very solid installation.
But when I put SureFire 500s on both guns, I had to go to a single point sling (the Giles wouldn't work with the new SF forend). When I replaced them I went with the CQB Solutions HST single point. I like the HST sling very much. It is somewhat softer & more flexible than the Giles, so it is more comfortable around my neck. I haven't had them long enough to compare the durability vs. the Giles, but I doubt they will hold up as well over the long haul, since the material is so much softer & more flexible...
IMO, you can't really go wrong with either setup. For durability, I'd go with the Giles. For wearability, probably the CQB Solutions....YMMV.
Edited to add: Lumpy beat me to it about the durability issue. I agree with him 100%, & when I replace the HST slings in the future, I may try the new Giles single-point.