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Typora is the best WYSIWYG editor. I can't stand split edit-preview editors in my notes, and nothing has done as good a job as Typora while also being local-only and open formats.

Not sure what would be considered premium, but Joplin supports KaTeX. The surprising thing about Joplin was just how much I would really love the Joplin Web Clipper browser extension. I can clip screenshots and web pages and they insert right into Joplin.

Beyond that, I use Syncthing (highly recommend if you're on Android) and I sync my Joplin notes between my PC, laptop, and Android. It works flawlessly.

I don't use Joplin because it botches my Latex, and I don't really use fancy Latex. Same with Obsidian and Zettlr. I keep going back to VSC but I'd like to see what a truly first-class technical notes experience would look like.

I'm a huge fan of obsidian.md. It should tick all your boxes.

what do you use on ios in your workflow?

Zettlr.