John's and Anagio's answers are more complete, they are not trying to avoid your question, but simply make you think that SEO is not a black or white answer.
But i don't want to leave a bitter taste in your mouth, so IMHO supposing:
- that both types of links are NOT
- that the pages cotaining those links do not contain another tons of links to all of crap sites, but just or mainly the link to your page.
- that the contents of the pages containing those links do have some relation to your site content, or at least the link itself to your site is displaied with a brief description explaing what your site is about.
Supposing all of the above, I would go for the incoming link from a PR9 page, expecially considering that the only PR9 page I saw so far is Google itself home page. So I would say that a link from Google home page to your site would both bring you a lot of traffic and also a lot of PR would flow into your site.
Moreover if you are just comparing pure numbers the PR is supposed to be on an exponenetial scale, in other words if we could suppose that a page get PR1 when it has 10 incoming links, it does not mean that the same page needs 20 links to reach a PR2, but more probably it would need 100 links, a PR3 might require 1000 links to that page, and so on.
Therefor guess the number of links needed by a page to make it reach a PR9: much more than 100!!!
So it also makes sense that one link from a PR9 page brings you something more that 100 links from PR1 pages, cause the effort to push a page to PR9 is much bigger than simply getting 100 incoming links from PR1 pages.