The very high end SRAM cassettes can actually be slightly louder because they are more resonant being machined from a single billet of steel.
While you can absolutely mix and match SRAM and Shimano 10 speed cassettes/chains, I generally match the chain and cassette brands when possible (regardless of the derailleurs/shifters). If for whatever reason you want, Red with an Ultegra cassette and chain would be (officially) an unsupported configuration but work just fine.