At least for me I think WhatsApp is more popular with older people (at least in Germany) while teens use it too they also use combination of different messengers in addition to it (Instagram, iMessage, Signal, Discord, Snapchat, etc.)
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I've installed (on a secondary phone) WhatsApp, Facebook Messenger, Signal, Discord, Instagram, Telegram just to be reachable for every friend. Germany is really scattered in regards of messengers.
10 years ago you could at least only have one client (trillian for me) for your different messenger services and google and facebook used xmpp so you didn't even need a facebook account to talk to your friends but alas here we are I guess.
It's a novel and technical not great idea but I always liked https://delta.chat/en/ in their approach to use a decentralized but common service like email for chat but there are just too many difficulties for a normal person to set it up.