The CyBook Gen3 also supports Mobi.
There are programs that also support PDF to LRF for use on the Sony 500/505.
Now from what I have read, screen quality is more variable from one unit to the next within any given line of readers in a production run than it is between the CyBook Gen3, Kindle, and Sony 505. They all use the same current generation e-ink screen.
As for the concerns you mentioned about formatting for your next device, these are all things you can control in the conversion. It is just a matter of selecting the right tool or tools and using them correctly. Any of the readers will produce a fine reading experience.
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