Some bloggers own their own homes. They've built or have had built blogs. These are the most expensive blogs on the Internet. But they own them and no one can evict them. However, they live out in the wilds and no one may even know they are there.
(Here is an in-depth explanation on how to create your own blog)
Other bloggers live in apartment buildings. The most highly populated buildings are WordPress and Blogger. Because they live in apartment buildings they have the potential of getting many visitors. But they are tenants so there's a danger that they can lose their homes--and all their hard work--if their landlords decide to close the building.
(Here is an in-depth comparison of Blogger and Wordpress)
Still other bloggers live on communes. The work of maintaining these blogs is divided more or less evenly between two or more bloggers. It sounds like fun until there is a conflict. Then what? Whose blog is it? Also, with so many contributors, it's easy to be overshadowed.
(Here's another interesting article: How to Start a Group Blog for Writers)
An author's website is your storefront; a blog is your home. It's where you can let your personality shine through. Are you an educator, an entertainer, a motivator, a promoter--tell your readers. They're interested. They want to get to know you. And through your blog, you've expanded your readership globally.