When comparing Google Inbox vs Type Mail , the Slant community recommends Type Mail for most people. In the question“What are the best e-mail clients for Android? ” Type Mail is ranked 3rd while Google Inbox is ranked 6th. The most important reason people chose Type Mail is:
Type Mail has clearly put effort in to make their interface easy on the eyes by following Material Design style guidelines and easy to overview by color-coding messages and including details such as service logos and sender's profile to quickly understand where the message is coming from.
Specs
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Pros

Pro Good-looking interface
Inbox follows Google's Material Design guidelines, making for an intuitive and smart looking interface. Bold colors with clear text and intuitive actions allow for one of the better looking in house Google apps on Android.
Pro Intelligent categorization
Inbox tries automatically bundling similar messages together. For example, Inbox will create bundles for travel information, receipts, promotions as well as group messages temporally. It enables also managing these bundles of messages together - they can all be swiped away together.
Pro Can snooze emails
It's possible to "hide" a message until a specific date and time or location, which gets the message out of your way until you're ready to deal with it. Swipe left and you can have the email disappear for a day, a week, a month, etc.

Pro Helps deal with messages quickly
Inbox has intuitive swipe gestures that allow quickly dealing with emails or groups of emails. It's possible to mark them done, archive them or snooze them for later by swiping. It allows you to keep inbox at zero messages easily.
Pro Surfaces important information from messages
If an email contains pictures, flight information, reservation at a restaurant, attachments, links, dates, phone numbers and other information that the application recognizes, it will surface that information in its main view. These items can be viewed and interacted with without having to open the message itself. It allows finding and taking action on the important email information quickly.
Pro Can add notes to emails
You are able to add notes or reminders to pinned items - very useful for long email chains when you can't remember what the main point was!
Pro Integrates Google Now reminders
For users of Google Now, Inbox integrates with the service allowing for reminders to be seen while using Google Now as well as set through the service.
Pro Integrates realtime updates in messages
Through a feature called Assists, Inbox offers context sensitive updates to messages. These include information such as flight status updates before a scheduled flight.
Pro Can create tasks from dates and tasks in messages
If a message includes a date, Inbox is capable of automatically creating a task from that information.
Pro Auto replies
Can reply to emails using an AI generated response
Pro Trips Bundle
Centralized "folder" for trip info such as airline, hotel, and rental car reservations. Similar to Google Trips.
Pro Categorizes mails by Bundles
In addition to the several automatic categories, you can also create your own bundles. Thus reduces clutter and enables you to archive a whole bunch of mails with one swipe.
Pro Good interface
Type Mail has clearly put effort in to make their interface easy on the eyes by following Material Design style guidelines and easy to overview by color-coding messages and including details such as service logos and sender's profile to quickly understand where the message is coming from.
Pro Android Wear support
Users of Type Mail who own an Android Wear device can receive notifications of e-mails on the device as well as manage an read them.
Pro Volume key scrolling
Type Mail can scroll through messages in the inbox via the volume buttons. So you can avoid swiping on the screen if you don't want to.
Pro Customizable swipe menu and email view actions
It's possible to customize what actions are performed and what options for actions are presented via swipes as well as email view actions.
Pro Unread badges
The app icon has unread badge that allows checking if there are any new messages without having to open the application.
Pro Emails can be snoozed
It's possible to "hide" a message for a set amount of time, which gets the message out of your way until you're ready to deal with it.
Pro A timed lock screen can be set up
Users are able to set timed lock screens for the app, protecting sensitive mail from anyone who would try to access it on the device.
Pro Smart notifications
Including LED, Do not Disturb times and customizable sounds.
Pro Unified inbox
Supports an unlimited number of accounts that can all be viewed from a single inbox.
Cons

Con Only supports Gmail accounts
No exchange email support or importing of any other e-mail services mail.
Con Will be shut down in March 2019
Con No rich-text (HTML) formatting for composing mails
Con No way to mark a message as unread once it's read
Con No way to delete a single message in a bundle
Con Privacy concerns
Your email is routed through Amazon Web Services.
