Rank Math is planning a PRO version. See this customer support post here: https://support.rankmath.com/ticket/rank-math-pricing/

Agreed that there are some things in SEO plugins that are hard to master. One immediate example is setting up your Facebook Developers key for OpenGraph. You have to have some experience with a Facebook Developers account to know how to set that up and find your own Facebook ID, which is hidden in the code on the front end and you need to View Source to find it. You also need to know what you're looking for.

And, while it's nice to have, so many plugins can now connect with Google Search Console that those fields for connecting to search engines are rendered moot. You also need to know what to copy and paste in those fields and how to get those identification credentials.

These things are explained by AIOSEO with tooltips to their own site knowledge base, but it's not made easy by either Google or Facebook to just connect and forget about it.

Personally, I love AIOSEO. Great team. And, in full disclosure, I worked for them for a bit to help rebrand and handle holiday email marketing campaigns a few years back. Regardless, they are super professional and have built a great plugin with terrific support.

As for Yoast, they've simply been much better at marketing. Getting Neil Patel and others to mention Yoast all the time and being listed as the go-to plugin so frequently on their blog and other blogs from other SEO publications gave them a hand up in the marketing world, but I've always thought AIOSEO was a better plugin, at least for SEO pros. To me, Yoast serves the beginner, whereas AIOSEO is a bit more sophisticated for an SEO professional.