When comparing GroupMe vs Taptalk, the Slant community recommends GroupMe for most people. In the question“What are the best messaging apps for Android?” GroupMe is ranked 23rd while Taptalk is ranked 34th. 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 Lacks advanced functionality that could get in the way of sharing
Taptalk lacks any additional features and choices that could take away from sending a photo as fast as possible. There's no preview screen that asks to reconfirm sending a message or choosing a filter. As soon as the photo or video is taken, it's sent.
Pro Offers a very quick way of sharing photos and videos
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. The whole interface consists of a single screen.
Pro One-to-one conversations increase chance of feedback
Limiting conversations to only two parties increases the likelihood of getting a response.
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 No groups
Taptalk only allows one-to-one communications.
