I have two right now, one from '86 with vented '86 G12T75's and the other in that '92 6960 cab (same dimensions anyway) with '92 G12T75's (more modern white sticker style). They sound extremely different, and I definitely prefer the vented G12T75's for the rolled off high end that makes them feel a lot thicker and fuller overall at the same amp settings.
I think with Marshall cabs in particular, the pretty drastic changes in the G12T75's and going further back, some of the cabs even up to 1990 had G12M70's, G12-65s, G12-80s, and so on. I think it's pretty commonly known that V30's have a lot of subtle version changes that sound different depending on the year right - the same is true of G12T75's. I always surprises me that people acknowledge that "old V30's sound different" but then will turn around and say "G12T75's suck" without understanding that they are so different. I have to blame youtube a little, I've seen quite a few V30 vs T75 comparison videos and it's always newer stuff (within the last 3-5 years) being compared. I know you know this stuff already because you say it in the video I'm just ranting at this point haha.
Anyway I'm off on a tangent, great video. I prefer the old cab in this video but I'll admit I didn't hate the new cab as much as I expected to. It doesn't have the same low end but the aggressive hair on it... I could definitely see a situation where I would want that kind of sound or might layer it with the other cab for example when double tracking. Super cool.