Discord allows creating voice channels to speak with friends and meet people. But it's important to learn how to use voice chats and channels to be aware of full possibilities.
Discord doesn't support welcome messages by default, but you can set up them using external tools. First, make a welcome channel.
Telegram feed may be chaotic if you have many channels, groups, and chats. The app has a way to organize things, though. Some time ago, they added chat folders, unlimited pins, and archived chats.