What is your Headless CMS of choice ?

Hello everyone. So recently I discovered the world of CMS like Sanity or GraphCMS.

Well, I already knew WordPress before but never paid attention to it since I wanted to learn how to code before learning how to make websites, so yeah anyway.

Do you have a preference for CMS in particular?

If yes, then which one and why?

Is a CMS more suitable for a specific task than another one?

Please feel free to share your knowledge and opinions with me in the comments.