I used a Kobo for a long time and I just bought a Kindle, because it was so hard to get articles on the Kobo. They stopped supporting direct file transfers from Mac, so I was left with Pocket, and Pocket didn't think a lot of what I tried to save was "articles."

So far I find that for my purposes, the Kindle is way easier to get content onto, and there's quite a bit of content I want that I can just buy there, but couldn't buy for Kobo.

I hope to not get locked in to the Amazon ecosystem but as of right now, my cheapest-model Kindle is way more useful than my old top-of-the-line Kobo.