Wow! I haven't been over here in awhile! This topic certainly caught my interest!!
A few things:
1. Professional ballet dancers may choose virtually any pointe shoe, for the most part. Many ADs won't care what you have on your feet as long as they are quiet!!!! To that end, point no. 2-
2. It is in many contracts here in the US that a dancer is responsible for keeping her shoes quiet for performances. And-
3. There is no such thing as a manufacturer's contract with an American ballet company where all dancer
must wear their brand; that is one of those urban ballet myths.
4. Having said that, teachers sometimes are my worst enemy because they want "all their students in __". Usually it's because that's what they wore. That doesn't work because feet are as different as snowflakes!
5. Different brands of pointes are constructed using different methods. Some are quiet- some not. Freeds are notoriously quiet because they are made form natural flour-based paste. The newer-engineered glue shoes tend to be louder, HOWEVER, if a dancer is taking care of her shoes properly, she can both make them last longer and make her performance pairs quiet.
6. Technique has suffered in more recent years in favor of tricks over artistry. To that end, dancers haven't learned the subleties of foot articulation- they are too busy trying to use their knees as earrings, and trying to break the sound barrier by spinning.
7. Can the brand of shoes that a dancer chooses change her feet? Absolutely. That is why choosing a shoe that will conform to the dancer's feet is important; you don't want a shoe where the dancer's feet have to conform to the shoe.
8. There are space-age materials currently in use in several styles, and one brand of pointe shoes. They have their niche, but as stated above, the feet need to already be shaped like the shoe, or else, the dancer is in for a world of hurt. On top of that, these shoes typically lose a bit aesthetically. They are however, very quiet.
In my opinion, Russian-made shoes are much, much harder than other brands. That combined with the different technique focus, can make a Russian corps louder. But I'm willing to overlook the noise in favor of the symmetry.