The audio in WA is good, but the video quality is TERRIBLE on WA.

LINE which I use more often is far better quality than WA.

I've found WA to be more stable on the audio front, and video is great as well. But I have an ancient 6s so I'm not quite putting out the highest quality video.

That's certainly true of Duo in experience.

This is demonstrably false. WhatsApp is so bad it makes my eyes bleed.