I am with JPH. I focus more on funnels than rubs or scrapes. However, I have one tree that I call the "killing' tree and it is a great funnel surrounded by telephone pole size rubs and major scrapes. If I had to hunt only a rubline or scrapes I think I would have to base it off the size of the trees being rubbed. If the rubs were at least 3-4" in diameter I would hunt the rub line.
Bucks and does alike, if I ever lose the rush leading up to and after a kill, I will hang it up. Knowing me, that will never happen.