i’ve seen looking into a lot of epub readers, and my honest opinion is that “Atril” seems to be the best, for a few points:
- atril has been in development for 20 years by the Mate project
- it’s solid and it wont break, this is crucial for avid readers
- the interface is clean
- it’s written in a fast language, wont take much resources (memory/cpu)
- and most importantly: supports vertical reading!