Hello yukon, I am now explaining some Pros and Cons of WordPress and Blogger. Hope this will help you to pick the best free CMS you need.
Control:
1) The things you can do on your blogspot blog are limited, and there is no way you can extend them to meet a need.
2) WordPress is an open source software, so you can easily extend it to add new features.
Appearance:
1) Blogger by default only provides a limited set of templates to use. You can modify the colors and layout of these templates using the built-in tools, but you cannot create your own layouts or make modifications.
2) There are thousands of free and premium WordPress themes which allow you to create professional looking websites. There is a WordPress theme for just about every kind of website.
Portability:
1) Moving your site from Blogger to a different platform is a complicated task.
2) Using WordPress, you can move your site anywhere you want. You can move your WordPress site to a new host, change domain name, or even move your site to other content management systems.
Security:
1) Using Blogger you have the added advantage of Google’s robust secure platform.
2) WordPress is quite secure, but since it is a self hosted solution you are responsible for security and backups.
Hope this will help you to pick the best one. Please let me know if you need to.
Regards,
Rasheduzzaman