When comparing GroupMe vs Mirage, the Slant community recommends GroupMe for most people. In the question“What are the best messaging apps for Android?” GroupMe is ranked 23rd while Mirage is ranked 39th. The most important reason people chose GroupMe is:
GroupMe has a built in function to read receipts.
Specs
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Pros

Pro Reads receipts
GroupMe has a built in function to read receipts.

Pro Great web client
GroupMe has an excellent web client that can be used to send and receive messages and manage groups from the desktop.

Pro IFTTT Integration
Allows sending messages from web services via IFTTT.

Pro Integrated calendar
It's possible to add location and time with reminders directly in the GroupMe app.

Pro Makes it easy to silence 1 or all groups
GroupMe has settings that allow muting a single group or turn off all GroupMe notifications from within the app.

Pro Does not require everyone in the group to have a smartphone
GroupMe can set up a custom phone number which allows people without the App to send and receive messages. This makes it easy to add anyone to messaging.
Pro Includes filters
It's possible to change the look of images and videos via filters.
Pro Groups
It's possible to send messages to multiple people at once. Either by setting up a group or by selecting a bunch of people individually. Groups can also be muted if they get too noisy.
Pro Messages self-destruct after they've been viewed
Once a message has been viewed, it gets deleted from Snapchat's servers. Thus, unless a person chooses to save the message manually (a notification will be sent if a user decides to take a screenshot), there will be no trace of it left. It enables a bit more consequence-free, in-the-moment kind of communication to occur.
Pro Generates a contact list
Once the account setup process is complete, Mirage generates a list of people from your contacts that you are most likely interested in sending messages via Mirage.
Pro Interface designed for getting things done quickly
Tap a contact to take a picture, tap and hold a contact to record video. Tapping the screen will allow you to add text to photos and videos just taken. Swiping the screen changes what camera is used. Swiping from the side allows sending text and voice messages. Voice messages are recorded the same way videos are by tapping and holding on a contact just from a different view.
Cons
Con Drains battery fast
GroupMe, in order to have a constant connection which allows for notifications drains the battery of a device quickly, which is not ideal for a messaging app that one needs on time notifications from.
Con Buggy
Messages get lost users have trouble getting their codes to log in and has trouble actually finding the users contacts.
