I'm not fine with Discord as a replacement for TeamSpeak. I recognise some of its advantages, but the voice quality is absolute garbage when compared to what you can get TeamSpeak to do.
Can you be specific? I don't need high quality voice quality for gaming. I need it to be good enough. I've been content with Ventrilo's GSM voice quality as well. My issue with Ventrilo wasn't the voice quality; it was the lag!!