We frequently see publishers who have a blog about cars but choose to select “Internet Resources” as their category in their control panel. One may think that the market for “Internet Resources” is bigger, so you might attract more links.
However, link buyers know that the relevance of the site is important to the search engines. By having your category match the content of your site, you attract higher quality links. Plus, search engines will pay more attention to your site if the content and links match.