BB Hub integrates better with the stock calendar, phone and contacts apps, which I prefer. Outlook weirdly provides notifications of emails, but then when you go to the app it has to refresh to get the emails. Also it does not always clear notifications from the notification panel when I read them in the app. Outlook also occasionally uses a different (weird) font for reply emails. Relatively minor things, but BB Hub does a better job with them. I was using BB Hub long before Outlook was working very well for Android. I probably would not subscribe to the 99 cents a month now with the way the Outlook app works. I would also note that Outlook for ios still has more features than it does for Android, which is annoying.