I do most of the reading on my quite old Kindle Paperwhite.
When Amazon changed the rules about downloading your own ebooks, I installed KOReader on it.
Love the customisability I get, and integration with Calibre. I now sync my library and progress with my phone (where I also have KOReader installed) using Syncthing.
I've also switched from Goodreads to Hardcover (there is a KOReader plugin for it).
I prefer to read on the Kindle because it has 0 distractions and it's easier on the eyes.