A Kobo would be a great choice. I use a Kobo Libra 2 and love it a lot more than my old Kindle Paperwhite that got stolen: https://gl.kobobooks.com/products/kobo-libra-2 The Kobo Sage is also good because it has an 8" screen.
Standard eBooks offers kepub format for Kobo devices and files, they use their advanced Webkit-based renderer: https://standardebooks.org/help/how-to-use-our-ebooks#kobo-f...