Could've just been a network issue, or simply because it was 7 years ago. I've been using Teamspeak daily with my friends for 6 years, hosted on a 5$ digitalocean droplet and the audio is far superior compared to anything else.

Discord is pretty sweet too, with screensharing, videos, better chat etc. But once more than 2 people talk at once in a channel, even with Nitro/whatever, it starts cutting people up. We can really feel the difference when going back to TS after a Discord call.