Who has better content? Dedicating a page to helpful content on successful blogging is a niche in its self. Personally, I have to say Copyblogger has really opened my mind up to some creative thinking. I've never read anything beneficial from Problogger. Darren's page layout is easy on the eyes. Problogger has a larger scope of readers. I wonder what they gain from reading his posts? I haven't read Copyblogger's background yet.
Aside from that I have just joined MyBlogLog you should too. If you haven't. It really is a network, a social virtual world you should be apart of.
...Still working on my image.