I d recommend Signal to newbies and people who switch from Whatsapp.
SimpleX imho is still too small and has no real security/privacy improvement
Discussion
Thanks for the input. I am not super technical and I want to use decent tools.
The thing is that there is no perfect solution, there is no absolute privacy, there is no absolute security.
Privacy and security sometimes even exclude each other.
It all depends on your grade of paranoia. Ending up like #Snowden, solding your GSM/Wifi chip off your devices makes sense but on the other hand it makes your daily driver devices practically unusable.