I loved my Kindle for the generic reasons why I love eBooks over paper books, but have come to love my Kobo for even more reasons, which have all basically been stated already.
Meanwhile, my Kindle sits in a drawer to reserve its serial number (already stated), and the battery gets completely discharged, damaging any hope of long term preservation because I can't turn the stupid thing completely off (also already stated).
The one big benefit that the Kindle had over the Kobo, for me, was the much better selection of covers, especially high quality covers. My official Amazon cover that I have on my PW1 feels so much nicer than the cheap third party cover that I have for my Kobo (the best I could find), and don't even get me started on how bad the official Kobo covers are.