I have played lead alto in big bands for over 20 years, from my college band at the Manhattan School of Music to the Lincoln Center Jazz Orchestra, and I can tell you that it is not about the gear. I like Brilharts, Runyons and Branchers. Other cats blow Vandoren, Link, Berg or custom one-off jobs. Find what is comfortable and flexible for you and the concept you have.
Just for general info, here is what some pros, past & present, play on.
Jerome Richardson-rubber Link
Jerry Dodgion-metal Link-rubber Berg, RPC-now on a Morgan of some kind.
Wess Anderson-Vandoren-Beechler-now on custom Manning.
Sherman Irby-Selmer "short shank"-customised
Frank Wess-Beechler
Chuck Wilson-NY Meyer bros
Dave Glasser-Ny Meyer-small chamber
Marshal Royal-Lelandais, Conn "comet" (runyon) sometimes Brilhart
Willie Smith-Lelandais "streamline"
I gotta go now. Maybe I'll think of more later. The point is, it's not what kind of mouthpiece you use.