We have kindle scribe and a kobo at home, the kobo experience has been way more rough for epubs. On amazon all I do is access amazon.ca/sendtokindle and I can upload the same epub to my phone and ereader AND keep the current page in sync. The experience with the Kobo is absolutely not even close to that.

And I agree with you I don't like the lock in factor, but I felt more locked on a Kobo than on a Kindle