The Send to Kindle doesn't allow Amazon formats. It's Amazon's conversion that give them copies of non-Amazon titles, mostly epub because the Kindle deliberately has no epub support. It happens to enable sync.
The Kobo ereaders use epub anyway.
The Libra Colour has much lower display quality than the Oasis. It's very much darker and the 300 dpi is crippled by the array of 2 x 2 coloured dots (150 dpi colour) which means it has artefacts if given mono 300 dpi content.
The Libra and Libra 2 were similar, but gone. The closest Kobo equivalent with buttons is a Kobo Sage 8″.
I've had an Oasis 2, still have Paperwhite 3, Libra, Libra 2 and Sage.
I've seen the Onyx boox color models in person.
I use my Kindles and Kobos via USB and Calibre. I tried "Send to Kindle" and really I find no advantage to it.
I use search to find the current location based on what I last read. Far faster than two WiFi syncs.
I don't bother with Kindle or Kobo apps on my phone or tablet but use a 3rd party free app (Pocketbook).
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