Software/tools for self-publishing books

I've recently published 2 books with Packt publishing which was an interesting experience but now I'm looking to start self-publishing.

My question is what software would you recommend/use for authoring books?
I used Microsoft Word with Packt. Now I'm looking the following software looks promising:

• Ulysses App
• Bear App
• Google Docs
• Scrivener

I'm thinking something web-based may be best then I can write on any device.

Each of these has epub export formats not sure whether I should care about the export options before I have even started writing?

Ideally, I'd like a tool that can create a table of contents that links to the chapters, can export to epub, and can help in making a manuscript file.

Would love to hear what other people have used.