I think some films are shot on more than one kind of stock, sort of matching the tool to the need. The example listed above, Rear Window, the 5248 is 35mm and 7248 is 16mm. The endless agonizing in cinematography or still photography on what film, what camera, what lens, what aperture, what shutter speed, what EV, etc. The whole world trying to figure out when Ansel Adams shot Moonrise, etc. I think is pretty boring. What and when never interests me, how and why are the meat of photographic creation.