If I remember correctly, Signal has a better encryption algorithm but the UI is terrible. Telegram is much more useable but slightly less secure.
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That was my understanding too. The biggest issue is having a critical mass of friends on either of them… And getting the family WhatsApp group moved somewhere!
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Dont have Instagram never will I have a face for radio as my profile clarifies 
Never install facebook on my mobile devides or the messenger, begrudgingly have whatsapp, if there is something out there that is better and not owned by facebook will give it a shot tried Viber but way to many adds
WhatInstaMess
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According to someone I know at facebook, Messenger uses the signal protocol internally so it’s end to end encrypted too.
From what I can tell from a quick bit of Googling, Facebook messenger has an optional secret mode for conversations (which by chance, I found the other day in the options on one of my conversations) which applies end to end encryption.
Unless you enable that (and I think you have to enable it for each conversation), your conversations do not currently have end to end encryption.
Signal
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