I don't really think there is some important difference in this aspect when it comes to SEO, but there are still some general rules about when to use posts and pages for a better user experience and overall performance of your WordPress site. This actually means that pages you should use when you are actually making some new page on the site where you add new products, offer, and something like that, and posts you should keep more for the Blog section and add new posts when you are adding a new article. Posts are usually parts of pages, so you create pages separately, and posts you implement inside of pages.