Is content added from a good comment better than a post for SEO

Is content added from a good comment better than a post for SEO? I have read a lot of documents about pages and posts. For now, I prefer having a page as my home page with comments. However, I am concerned that I may not get credit for the good quality high keyword content that I have in comments I approve to be included on my page. Thus, is content added by readers better if left as a comment or a post?