So there's a LOT of controversy here.
TeamSpeak is the OLD standard. TeamSpeak is what everyone USED to use. A lot of people still do.
When I first started using Discord, I was EXTREMELY resistant. It has a learning curve JUST LIKE FANTASY GROUNDS DOES!
It does take some getting used to, but once you do, you'll react the same way you did when you when you started using FG, you'll never go back to anything else.
I uninstalled TeamSpeak about a year ago. I understand there is a lot of resistance to Discord, but there is now an official Fantasy Grounds Discord server... (https://discord.gg/ezNkcnq)
THIS IS THE WAVE OF THE FUTURE!!! Everyone should get on board. FG Con 12 is using this as it's main communication. My suggestion (and this IS only my humble opinion) is to try it out and give it a chance. You won't regret it.