WordPress deserve to be number one because it can be seen from the number of blog or web managers who use this CMS. WordPress provides a very complete feature and good data security.
A writer in a blog or admin in managing a blog is required to login first. This of course the security of the website or blog is very awake. Plus in wordpress you can install a security plugin to filter spam comments.
A blog of course will get a good ranking in the eyes of google if have atikel or content that SEO and useful for readers. For that in WordPress provided a plugin named Yoast SEO which is useful give the value of whether your article SEO or not.
There are still many excellent features in wordpress, this is what makes wordpress dubbed as the best CMS and most users.
