Horological Meandering

Allen
1851

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First off, the sound from the videos sound quite different from the actual watch.

So again, we cannot directly compare the sound quality of the watches from the videos.
For instance, the Dufour Sonnerie sounds much better in the metal while some others sound much better in the videos.
There are so many variables that decide how good a striking watch sounds that you cannot simply say that one case material is better than another.
In my view, the gongs determine more than half of how a repeater sounds. Tuning the sound of the gongs is an art by itself. What method are the gongs made: machined, extracted, or soldered. How the gong material is heat treated, how it's filed down at the base and ends, how it's attached to the block, where it's attached to the movement. Is it one piece or two piece or even three. Modern gongs that are cnc machined vs traditional hand made ones sound different too.
There are so many variables that even two identical repeaters that have the same case metal and movement will sound different. Just like musical instruments that sound different after tuning.
Some case metals do seem to help with transmitting the sound out of the case with a light weight material such as titanium, but I don't think it makes the sound quality better. As you can see with the skeleton Vacheron repeater, if you hold the watch against a thin material such as a piece of paper, it will amplify the sound. I have heard many say that platinum is the worst case material for repeaters, but I have heard many platinum repeaters that are much louder and clearer than some gold cased repeaters. So in the end, it all depends on the individual watch, hearing them in the metal and deciding if you like it or not.