How will you be using it and where? If you have to carry it camping/hiking on your back I would go with the claytor tarp. If your setting up a base camp type thing the sg tarp would be nice. also big tarps can be difficult in small brush filled places.
EDIT...The claytor tarp may take two weeks or more to receive, its a good tarp if you can wait that long.
Yep - something for my pack so the lighter weight is appealing to me. I have several large Home Depot tarps for car camping so it's not really for that.