I have tried many mail service but not a single email service is as sensible as gmail.
It is well organised and all the mails are systematically handled, it has separate option for the junk mails, spams and many more which makes life easier.
The notification is also smartly programmed and the response for the notification about any mails, or any security threats is just mind blowing.
And I am impressed with the sublime service that it offers.It even informs about the logins from some other sources. Which I guess no other mailing service has yet any option for that. The security on Gmail is unbeatable, no one can get any unauthorized access to your gmail account.
It will be definitely the primary mail for me and for any work I will only trust gmail.