If a pr 5 page (on which 100 external links ) ,a pr 4 page (on which 30 exterenal links) and a pr 3 page (on which only several external links) link to me. which contribute to me most pr value? if three links with the same xxx anchor text link to me.(similar content),which will raise my position in serp most with that keyword?
I say pr4 but Pr 3 site might be better because of less links. Do both sites. The pr5 with 100 links is no good any site with 100 links is not good. Sites with 50 or less are better.
PR4 will do better. But you may note that the theme of the site and its principal keyword should also relate to yours to get the full benefit of backlinks.