For talking other player we have long used TeamSpeak, but we have now switched to Discord. We mainly did this because it is way easier to join Discord for new players, it is as simple as clicking the link below and creating an account, all in your browser! After this you can of course install it on your computer and/or download the mobile app.
Next to this the interface of Discord looks a lot nicer, it has more features like adding friends, private calls and being in as much servers as you want at the same time. In the end it is also a lot easier for us to manage, permissions are less complex and in the future ranks will automatically be synched between Minecraft and Discord.
Have fun in Discord, and if you have any suggestions, questions or problems let us know!