For sure, Wordpress is the simplest; but it's not the only option you have. I would also suggest the following, in case you are interested..
1) Drupal - Security wise, it is far better than most of the cms platforms. Customizing it can be tough though.
2) Concrete 5 - I have done some sites using this platform. Making a theme is pretty simple. Speed is also good, if you know what you are doing. It is mostly good for sites that are supposed to be informational only.
3) Joomla - It is not out of competition yet. Theme making can be tough, and there's a steep learning curve involved.
4) Yii2 CMS - Yii is an awesome framework. Although, I have not used this extension for Yii yet; I am quite familiar with the framework and I can vouch for it. If customization and speed is what you are looking for, give this a try.
5) Wagtail - built on python django, this is a very popular cms platform these days. If you are already good in python, there's no reason to not consider this option.