I prefer Signal and it provides encryption.
I haven’t noticed any major UX issues but I use it for one thing only
Telegram is indeed the best like others are saying, and WhatsApp is a distant second.
Never had any problem with Signal.
Other than that it just works
Signal is fine for messaging. Not bad, not amazing. I'd have a much easier time convincing people to switch to Signal if it would've had a client as good as Telegram's, especially for the desktop application.
That said, Telegram has been adding more and more annoying premium features that distract and annoy.