Talking about 2 different things. A link from any authority site will help, like the New York Times. Just any old high PR link from an unrelated site may help a little, but may not at all, and it is highly unlikely that it can hurt you in any way. I would say impossible, but I do not know that to be 100% true. To answer your question, the PR4 gambling site. Also, the link value depends on which search engine you are talking about.