When comparing TeleMessage vs Riot, the Slant community recommends Riot for most people. In the question“What is the best team chat software?” Riot is ranked 3rd while TeleMessage is ranked 64th.
Ranked in these QuestionsQuestion Ranking
They've been in the messaging business for over 15 years. Not a start-up, and use carrier-grade infrastructure.
They offer a bunch of APIs that you can integrate with own apps to automate messaging.
Pro Desktop and mobile software
While the solution includes an app, messages can also be sent from a computer or Outlook. It can send data messages, text messages, voice messages, etc (as long as there are enough message credits).
Pro Administrative access
An organization's mobile messaging can be managed by an administrator. That means admins can add, delete or suspend users and enforce messaging policies.
Pro It's secure
TeleMessage uses end-to-end encryption, with an additional encryption layer while data is in transit. It also offers a bunch of other security features such as PIN lock, time limited messaging and forward locking.
Pro Uses Matrix, the open communications protocol
Pro Supports text, voice, video
Integrates with Jitsi for multi-party video chats
Pro Web and mobile (iOS, Android) versions available
Pro Bridges to other networks
You're not confined within Riot's or even Matrix garden, and you don't have to make users of other networks switch to Matrix.
Pro Widgets support
Want to watch that flick at YouTube and discuss it at the same time? Have Grafana graphs stacked above your DevOps team chat? Collaboratively edit Google Docs and chat over without switching applications? This is possible with Riot.
Pro Very good and simple interface
Riot has a very simple interface, adding the ability for more unexperienced PC-Users to use it.
Con Still in active yet early development
There is clearly a User Experience issue esp. in web version which the developers are aware of and are working hard to improve. They've got the concept concrete, so UX won't be an issue in no time. Most often used parts are functional, but some are yet not.
The success of riot depends on how fast the development is, or it'll get outdated too quickly as developers of Signal and Telegram have predicted.