Which Is the Best eBook Company for Authors?

I’ve been exploring options for self publishing and keep seeing mentions of the best eBook company, but it’s hard to know which platform really delivers. Has anyone had experience with them regarding royalties, distribution, and ease of use? Are the tools beginner friendly, and do they provide good support for authors who want to reach a global audience? I’d love to hear honest feedback before making any decisions about which eBook company to go with.