I am going to buy the 12x12. Not much weight difference between it and the 9x9
I think the 12x12 would be a little large for me. I debated for a while before buying the tarp and I figured that the 9x9 would allow for more choices in sites to setup. Sometimes it's even a little hard to find a spot for my 9x9 when I do backcountry camping and I am out in the bush with lots of plant ground cover.