WordPress is an ideal solution for those who are looking to launch an official blog or website. It offers excellent functionality out of the box, plus an infinite list of plugins and add-ons to maintain your blog so it looks fresh and flexible.
And if we talk about Medium, it is best suited to the lone wolf bloggers, who possibly already has a heavy following on social media platforms like Twitter and Facebook. From there, they can pull those same followers to their Medium blog or account, and start to build a reputation within the existing Medium community. It is also good platforms for those who don't have much knowledge about development or programming.
Because some time WordPress requires some changes according to the layout but in Medium you get a single editor and in that, you just need to enter your content and publish it.