I'm a bit biased as I haven't blogged on Wordpress for a few years and I'm currently building on Ghost.
Ghost is a much better and simpler environment for writing and blogging. The built-in member features allow you to natively create newsletters, both free and paid, which is brilliant (and there are no fees, compared to Substack's 10%, for example). With Zapier, you can also sync native members to any other email service.
They're both easy to set up. I just find Ghost a lot "calmer" and nicer to write with. Wordpress has a huge developer community and a ton of plugins to shape it how you want. Ghost is more focussed.
For writing and newsletters, I'd pick Ghost.
I have two blogs running with the newsletter feature, so new blog posts go out automatically to members. It works well though it's limited in beta.
I see an opportunity for a newsletter-first Ghost publication, though, and I'm actually building a theme that pushes posts behind a simple homepage, similar to how Substack or Mailchimp handle online/archive content. I haven't seen many Ghost sites work this way but I have a feeling more newsletter-first publications will come online in the next year.
Mixpanel, Amplitude and several others are more for B2C use cases. Coz of this, account level (usage at the company level) grouping is either very tough OR available only at their enterprise-level ...
Thanks for sharing your thoughts! Ghost's writing environment is absolutely a huge plus for it, as are the new newsletter/subscription tools. Have you setup a newsletter via Ghost yet?
Cove looks really nice—exciting to see something other than Disqus as an option for comments on Ghost.