I dunno if its still the case, but AV1 used to be about the same bitrate as the VP9 streams, effectively making them higher quality streams. Another experiment

I dunno if its still the case, but AV1 used to be about the same bitrate as the VP9 streams, effectively making them higher quality streams. Another experiment I have done: download the AV1 and AVC streams, and average them with VapourSynth.