For me it’s purely the multi-device experience across e-reader and iphone app. Access to my purchased books from either device anywhere, and flawless progress

For me it’s purely the multi-device experience across e-reader and iphone app. Access to my purchased books from either device anywhere, and flawless progress syncing. I don’t take my kindle everywhere, sometimes I just have my phone but still want to read. I don’t believe this is as easy with Kobo as with Kindle (or even possible). If it is I’ll switch.