- The ability to message someone with just your username / without revealing your phone number
- Easy to use from multiple devices (with full history the minute you install it on a new device)
- Great bot api
- Channels (like an rss feed, people may join to get info, but only the admins can post)
- Much larger groups
- Much larger per-file size limit when sending files
- Message scheduling
- Multiple accounts in the official client
- Polls / quizes
- Hashtags / stickers / animated stickers / etc
- Uses an encryption protocol (now in it's 2nd revision as of 3 years ago) that's been independently audited. (For comparison: Signal's encryption protocol was sponsored / paid for by the US Govt and is used by Facebook's WhatsApp. Telegram has been banned in multiple countries for refusing to turn over data to the govt as well)
Signal advantages over Telegram:
- E2E chats are the only type of chats offered.
TLDR - If you use mostly 1:1 chats and E2E is important to you, use Signal. If you use mostly group chats or want ease of use to get your friends / family on board, use Telegram. Both are open source and have had independent security audits, which is better than WhatsApp!