I am trying to convince my group to switch from WhatsApp to Signal and we plan to vote on it soon. So, I plan to use the replies in this thread to compile a list of reasons to use as talking points. Preferably, I need something that can be understood on a personal level as some of my friends are deeply cynical and have no concern about escaping techno-feudalism and surveillance.
They are not comparable in my view. One is owned by Facebook, known for MITMing smartphones via a VPN app and successfully intercepting and decrypting traffic from competing apps.
The other is widely regarded to be the best option for most people and most uses cases for privacy and security.