I am using both gmail and outlook app on my phone. The thing I like about outlook is that it uses push rather than sync, I don't really like the app's responsiveness. On the other hand, because I don't normally on my sync option, I have to manually go to gmail app to refresh to see if I have new emails. However, I do love how gmail app works. It's really tough, even though I am happy to hear about this news, it's still hard to decide if I would go with all-in-one.