I like to use WhatsApp, everyone I know uses it. Some people tried to switch to Telegram during the hype, but eventually they switched back to telegram.
I voted for Telegram but I also use Messanger. I use telegram for professional communication, whereas I use Messanger for personal communication. I have never used whatsapp.
WhatsApp will always remain my favourite chat messenger because it allows me to chat with only those that have my personal contact with and that helps me to know whoever I'm talking with especially when it comes to dealing with strangers.