For basic web client, I've tried several, but always end up going back to coracle.

I use highligher.com and habla.news for posting long form notes. I originally used Habla exclusively, but I've now found Highlighter more convenient because I compose and publish on substack and then I copy and paste into Highlighter. With Habla, I always had to reformat numerous things and it wouldn't allow me to have bold inside offset quotes. With Highlighter, now, I can just paste and post with no additional work. If I was going to compose inside the app, I think I would prefer Habla, but the way apps are continually updated, I'm not sure.