Is it better to have a backlink on an inner page with no PR of a high PR site OR to be on an inner page with PR rating? For example: Site A.com has a PR4 rating and site B.com has PR2. You can get a backlink on A.com/A/ that's PR0 OR B.com/B/ that's PR2, which is better and why?
I'll say think of the future, a high pr site usually gets a good pr in all its pages. If it doesn't have a pr in a post now, thats because the post is newer than the last update of pr and will be considered higher than pr2 when google updates pr again.
I would expect that a high PR site would also have PR on most inner pages, but I'm finding that not to be true in many cases. I have a few PR2 directories where most of the inner/category pages are also PR2. But I'm noticing that many PR5 directories have very few or non inner rated pages. And I'm not referring to new sites, a few of the sites that I've monitored regular has had PR5 over a year.
It's always good practice to build back links for internal pages, also... As earlier rcj662 said, some internal pages do not have any pr.. he is right,,, Cz if you have more than 2k pages on your website, it's not possible for google to distribute PR to each and every pages...
It'll be better to have a link on the page with PR if you're only looking to improve the PR. However, there are a 'number of factors' to be considered other than the page's PR.
The page that is more relevant to your site regardless of their PR is the best link for your site IMO
If this is really PR0 (not N/A) you may choose PR0 link if domain that links to your site is old enough. You'll get some trust rank from such link.