Having horns with Stainless Steel (Bauerfine) Taylor and Eclipse, Monel Selmer, Nickle Plate Selmer Cornet obvious valve recondition 1st valve, Bronze Boosey Solbron Holton Llewellen, if valves and casings are clean and free from deposits and lubricated all for me work well for me, no perceptible differences.
What is more important to me is alignment, the Eclipse Tsylor and 1949 Olds Super have the best alignment of all my horns, happen to be the best players, currently investigating aspects of alignment, will start a new thread when I have more data.
Regards, Stuart.