Oil cloth all the time in a 10 x 10 personal tarp, but that was too heavy. The best I've ever been out with was Egyptian Cotton. Extremely dense weave, very light and large enough to just divide in half with a centered rope or pole between a couple of trees. I could keep it at ten by ten with a big weight savings
Toward the end of my trek career I got fanatical about saving weight, and always justified dense weave cotton because in The Newbury Parish there was a Cotton Mill in the 1740's . I preferred not painting it because I judged it added weight. I conceded to Thompsons, which was the best at the time and you could judge how dry it was when the smell left after about a whole day in the sun. Pretty sure what we used to do was load it and an entire can into a plastic garbage bag and kick it around for two or three days before hanging it to dry.
I colored the Egyptian Cotton one sort of a brownish grey and several folks commented on how it was virtually invisible in the woods. Good for the ego...
When interested in Rendezvous fell off and I sold everything, I kept my shoemaking tools, a couple of lasts, my personal gear, two guns and two cloths. Even the light canvas ( cotton) one I kept was built to be a lighter grade, and I believe it is this one, which did well on canoe trips.
But, then again, that was a long time ago...