Tried both, 70mm (65mm is video, 5mm is audio) is just superior in every way. There's nothing out there that compares, digital projections are still far behind.
Hmm are you sure 5mm is audio?
This article claims Audio is added via USB Stick or CD
https://www.theppt.org/rewind/articles/where-can-you-watch-t...
Knowing nothing about this, it's a little bit wild to see two comments on the same page making diametrically opposed claims.
https://news.ycombinator.com/item?id=49122568
Does anybody have the technical knowledge to compare a RED video camera to 70mm IMAX (or maybe you just meant 70mm?)