I have a blog with adsense on it, and from my experience in the past few months, I can't tell whether or not a blog post that has a youtube video in it embedded as the sole content (maybe with a sentence or two as an intro), or a long article with about 250-400 words is better. Logically you'd think, hey, articles have tons of key words, you can bold/italic key words as well, and therefore the ads are more targeted. But sometimes the CTR on my video blog posts isn't great BUT my earnings are very, very high. What do you think, video blog posts vs. article blog posts? Which one yields better-targeted ads in your experience?
you must have some content on your page. adsense usually plays better with text content-rich websites.
I think article places the main role in Generating maximum revenue for your blog. Thus more fresh content you have, the more you'll earn.