I read on an old Kobo, using Kepub files. Their Kepub renderer is quite good.
I think Kindle's renderer hasn't changed significantly for many years, and it had always been pretty bad. I always say that Kindle seems to have been created by people who hate books.
The best renderer around is iBooks on an iPad, which as far as I can tell uses an up-to-date Webkit.
I read standard .epub files with KOReader on my Kobo Aura H2O. It's faster, nicer-looking, and more customizable than the stock reader, and the installation instructions were complete, correct, and easy to follow.
Kobo Libra 2 is a great e-reader. Works well one-handed (screen rotates for left/right hands), has buttons for page turns. Integrates with Overdrive (what Libby uses). Drawbacks are Kobo's bookstore is weaker than Amazon/Apple. Screen is also not flush which means some dust can collect in the recess.
I think Kindle's renderer hasn't changed significantly for many years, and it had always been pretty bad. I always say that Kindle seems to have been created by people who hate books.
The best renderer around is iBooks on an iPad, which as far as I can tell uses an up-to-date Webkit.