I've been using a 2nd gen Paperwhite for a long time. This might be the one I upgrade to (for the waterproofing and the warm light).

I really don't like Amazon though, so it's been a hard justification. Kindle is the only thing left I use that is Amazon.

I've thought about switching to Kobo, but I'm not sure it's worth it with how easy everything is on the Kindle.

I run a docker container with Calibre, and I use it to send all my books to the Kindle over e-mail. I would lose that functionality on the Kobo. I'd have to go back to manually syncing which would be a pain.