Signal is good for normie friends, and family but for my schizo privacy junkie online friends I use SimpleX.
Rarely do I use signal with people from the interwebs unless I've met them IRL already.
Discussion
If SimpleX is good enough for my shizo privacy junkies it's exactly the right fit for my family.
Main pro of signal is that it's normie friendly, has a good UI, has a notable user base already, and has optional discoverability, and optional privacy.
I like SimpleX a lot but it's got a high learning curve, a UX that is still early, and otherwise just isn't convenient for people you know IRL.
Might do it with privacy people but I feel like signal is the winner even if simplex in theory has better opsec.