Freelancers are probably the broadest category by far. You have cheap freelancers operating out of countries like Bangladesh, India, and the Philippines who pump out bare-minimum content for just a few dollars at the low end. Some of the web content may even be stolen or spun, with essentially zero attention paid to topic ideation, keyword optimization, images, or any of the assorted trappings of a successful blog. On the flip side, freelancers can be some of the most well-rounded individuals you can hire. They may have impressive and nuanced attention to detail, tools for optimization and uniqueness, and a deep knowledge of SEO that allows them to manage a blog for you entirely. Most, of course, fall somewhere in the middle. Freelancers are generally a good fit for businesses operating on a very tight budget, who don't care about quality, or who do a lot of the legwork themselves.