Mag sound is often considerably better than optical sound.

Mag 35 can be miles ahead of analogue optical 35mm.

However, it depends so much on the mastering process, the quality of the optical printer etc. etc.

Some interesting notes from a film maker here:

https://www.questia.com/magazine/1P3-1276641111/new-improved-16mm-sound

Some ugly, but informative reading is here:

Sound isn't my strong suit, so I could be way off, but I find 16mm tends to be missing most of the high end, and some of the low.