Not the OP, but from a privacy perspective, I would pick Signal over Telegram. They both have some issues, but Telegram is not E2EE by default and is a bit if a pain to use E2EE consistently. And yet, Telegram claims to be super secure, etc. There are a bunch of other issues there as well. I'm not saying Signal is the best privacy tool out there. But, between the two, I trust Telegram a lot less.