Telegram is easier to use on multiple devices (it synchronized automatically and you don't have to worry that if you leave one device open, you won't get the message elsewhere)[...]
XMPP supports this, but regrettably, almost no clients implement these features. It's a huge shame that so many dev create brand new protocols+clients instead of implementing these features for existing XMPP clients. But I do admit that as-is, users can't pick up any existing XMPP client that supports this. :(
OTR (Pidgin, Gadjim and Adium each implement OTR differently
I've been using this daily for a few years now. I've always used pidgin, while almost none of my peers have. OTR is also standard, so I'm really not sure what you're talking about.
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XMPP supports this, but regrettably, almost no clients implement these features. It's a huge shame that so many dev create brand new protocols+clients instead of implementing these features for existing XMPP clients. But I do admit that as-is, users can't pick up any existing XMPP client that supports this. :(
I've been using this daily for a few years now. I've always used pidgin, while almost none of my peers have. OTR is also standard, so I'm really not sure what you're talking about.