Aqua Mail vs Missive

Has been rated well on AndroidForums.

The app refreshes emails in seconds and has an intuitive menu. You can do a lot with one or two swipes.

It's possible to backup the app along with account settings via services like Dropbox, OneDrive, Box.com, Google Drive.

Tasker is an automation app. Aqua Mail's Tasker integration allows changing settings, triggering message based events and running mail checks based on criteria like time of day, location, timer, connection type, etc.

The developer usually gives a 25%-50% discount every few months or so on Google Play.

In Missive you can live edit an email draft with your teammates, the draft composer acts exactly like a Google doc. Each team member has a different color cursor.

The email section allows for consuming all of your email accounts in it, utilizing shared addresses (help@acme.com), personal work inbox (philippe@acme.com) and personal inbox (phil@gmail.com).

It’s important because the collaborative part of Missive becomes useful when users consume all of their emails within the app. You not only want to collaborate around emails sent to your company help@address, but also around the really important emails you most likely receive at your personal company address, like that really important email you received from a potential high profile partner.

Missive is also a team chat app. When using Missive you can ditch your email client, chat app and help desk.

Merge all email accounts in one unified inbox.

You can create multiple tasks per conversation all assignable to a single or a group of persons.

Nicely written software. Always works as you'd expect, beautifully designed, a classy piece of software.

Supports multiple organizations with one user login.

Know exactly if and when the recipients read your important email.

Supports Gmail shortcuts.