If you want to get things done and don't care about the UI, I don't see much difference between Yoast and Rank Math.
I personally use Yoast SEO on some of my websites and Rank Math on others. The one thing that got me to start using Rank Math was that it offered a straightforward solution to change the SiteMap URL. Other than that I don't see much of a difference in the usability and functionality.
By the way, I only use free versions even though we have access to premium versions. I think some users make the mistake of using the premium just because they can, even though they don't actually need the functionality in many cases.