I'm coming from using a Windows Phone so you need to keep that in mind. I've always used a Windows Phone so big difference for me.
I still like managing email better on a Windows Phone. I connected to my exchange work email using the Gmail app and didn't like it too much. Then I downloaded the Outlook App and used this and still don't like it as much as the Windows Phone.
Connectivity options are much better. I can finally VPN in to work and manage machines which I couldn't do with the Windows Phone.
I like the Google Assistant so far. Not as personable as Cortona though but functionally just as good.
As far as form factor, I still like my Windows Phone as it was a little smaller and could easily fit in my pocket.
Phones are extremely subjective to the user using it however.