When comparing Trillian for Business vs SecureChat, the Slant community recommends SecureChat for most people. In the question“What is the best team chat software?” SecureChat is ranked 22nd while Trillian for Business is ranked 24th. The most important reason people chose SecureChat is:
Supports threads to organise conversations into topics.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Comprehensive security and privacy policy
Trillian seems serious about security and privacy, and is ready to explain in detail how they architect their service to achieve these goals.
Pro Self-Hosting available
If you are worried about third-parties getting access to your data you should consider self-hosting. With self-hosting you are in control over where your data is stored, who has access to it. You will also not be vulnerable to exploits of a third-party provider. Trillian supports both cloud hosting and a self-hosted Trillian Server.
Pro Native clients for Windows, Mac, Linux, iOS, Android, and Web.
Trillian has fully native apps for Windows, Mac, Linux, iOS, Android, and Web.
Pro Multi-protocol support
Chat with other Trillian users or those on Facebook, Google, AIM, ICQ, XMPP, Yahoo!, Twitter, and more.
Pro Threads to organize conversations
Supports threads to organise conversations into topics.
Pro Expiring messages
Channels can be configured to have expiring messages that get automatically deleted after a pre-defined time.
Pro Guaranteed delete
Ensures messages are fully deleted and removed from backup.
Pro Servers 100% hosted in Switzerland
Protected by Swiss data privacy - some of the highest data privacy laws in the world.
Pro Encryption
Strong end-to-end encryption of messages and files.
Pro Drag and drop files
Drag and drop documents, photos, videos into the chat.
Pro Integrates with other tools
Built in integrations for Zendesk, Trello, Github, SupportBee, etc.
Cons

Con Non-free / Propritary Software
The code base isn't free/libre and cannot be self-hosted, therefore there is no proof that encryption or "guaranteed delete", actually work. There is no reason to think this application is secure.
