I don't understand how you think Kindle is more portable. Kobo works with ePubs and they support Adobe's DRM which is used in a lot of stores. There's nothing t

I don't understand how you think Kindle is more portable. Kobo works with ePubs and they support Adobe's DRM which is used in a lot of stores. There's nothing tying you to Kobo's store and almost every ebook store that sells epubs is compatible. Meanwhile Amazon has been constantly messing with their proprietary format, DRM etc. Any book bought outside their store also almost always needs conversion too.