Can't wait for this to land on the iPad. I despise WhatsApp with a passion but it's an undeniable reality in large parts of the world, including here in India, so I might as well use it where I find convenient.
I use both WhatsApp and telegram and to be honest in daily use they might as well be the same app.
Other than the fact that it's owned by Facebook, I don't see any issues.
For 1-1 or smaller chats they're mostly interchangeable except for Telegram's better support for multiple devices.
I've been chatting in unencrypted channels since the mid 90's so I don't exactly see E2EE as a hard requirement.
I'll switch my family chat to Signal or whatever as soon as I can add my home automation bot in there without some weird hacks or custom clients. The current implementation is a glorified Curl call for Discord and maybe 20 lines of Python for Telegram.
For Telegram Group Chat - it is not end-to-end encrypted, Telegram uses distributed infrastructure approach to protected data not covered by End-to-End encryption. I wouldn't consider WhatsApp's Group Chat end-to-end encrypted.
That's a pretty big issue for me - whilst the original team were in place, I had a degree of trust for them, but since their departure (and the stories as to why), I trust it less and less.
Unfortunately, for me and everyone I know - it's either iMessage or Whatsapp (depending on your choice of phone).
It's a pretty big issue, y'know.
Just went to web.whatsapp.com and made it a home screen shortcut in Safari.
For example, I'd like to be able to use Signal on both my main phone and my second phone using the main phone number.
Second SIM bound to same identity isn't the same as non SIM adjunct device support.