When working with a client, WordPress is the best choice for your site management.  This is because WordPress is beginner-friendly. When you build a site you can pass it on to the client and they can post on the site and and edit content without messing up the design. This helps you prevent the client from having to come back to have you fixed problem caused by them messing up the code you spent hours working on.

Another reason WordPress is a great choice is it is great for your SEO. WordPress optimizes your site so that it loads quicker and is mobile friendly which helps to rise your site in a google search. This helps you when doing a site for a client because the more hits you can get them the better.

Below is a cool infographic I found about WordPress.