The link in this article references the 200 million blog post milestone celebrated at Wordpress.com. That is a lot of blog posts. More importantly it is a lot of blog posts for customers to search through trying to find your blog posts. That is why where you put your blog is more important that what you say.
Unless you are actively marketing your blog you need to make sure your blog is hosted some place that gets visitors already. This is the idea behind our neighborhood websites and just one more reason why a neighborhood website is a much better place to setup your business blog.