Our web design services are based around WordPress. We've tried other systems but our customers like to be able to update their own content easily, and have a wide range of additional functionality. So for us and our clients, WP works really well.
If a client wants to control the site themselves after we've created it, we will generally use a builder like Elementor as it's easy to use for non-technical types. For technical types or for sites where we maintain the content on behalf of a client, we will not use a basic builder..
One thing we always concentrate on is mobile-first use, so you will always know that your site looks good on a mobile device or tablet, and just as good on larger screens.