A lot of times I see what appears to be "inflated" PRs. That is a website that looks "weak" with very few backlinks... yet is PR5 or something. Does a link from these site really count? ALSO, i stick these into Ahrefs.com or Opensiteexplorer.com and it shows no authority. And sometimes I put a website that's only PR2 or 3 but in Ahrefs.com or Opensiteexplorer.com it shows pretty decent authority. Which do I page more attention to?