Which is the best platform?

I've been using Kindle and would like to know if other platforms might be better in some way. I'm an Apple user, so I have Apple Books but haven't used it much. Is there a reason one might be better? Are there other options I'm not aware of that people love? I have a Kindle but never use it. I read on my phone and on my computer.

I'd like to know if there are drawbacks or benefits to switching out of the Kindle ecosystem.