I don't generally put too much faith in either. I see rubs everywhere at most of my spots. Coincidently they are mostly where the deer travel anyways. Isolating a specific rub line is very difficult. I might get a little excited over a BIG rub, but I'm not likely to sit over top of it.
Scrapes are another thing that doesn't work out much for me. We get a lot of little scrapes here and there. However, if I would find a BIG active scrape that is being worked during that late pre-rut time, I will hunt it or fairly close to it. I just rarely find those.