[No ragebait] What would be more suitable for casual chat where phone numbers is not required to share Telegram or Instagram?

The use case is for workmates or not so close people who I dont want to share my phone number with. I would like to talk about movies and other hobbies, but dont want to give out my phone number so they can call me. The goal is to create groups so just a username handle would be seen by them instead of my phone number. It should be something with the userbase: so I was thinking between Instagram and Telegram. What would be better for this case? I have whatsapp but its taking so long to release the username feature.