I always recommend GNU Jami.
as for reasons, it respects our freedom and privacy, it runs on most operating systems for desktops and mobiles, and it doesn't depend on any proprietary infrastructure that could exploit us, censor us, or otherwise snoop on us and be enshittified? thanks but no thanks, I don't wish to get Zuck (or anyone else) involved in our private conversations. as says a friend of mine, why should I go along with your platform of (poor) choice, that would screw us both, but you can't go alone with my platform of choice, that would keep us from being controlled and screwed with. besides, your platform of choice would require me to carry a tracking device.
that's how I generally respond