I am a fan of wood snares. The Jazzfest and Radioking being the holy grail. That's my reason, not that I don't think the 400s are bad or anything.
Larry, I'm with you. I own two Supra's and two COB Dynasonics. They're fine instruments and project strongly, but metal shells are just different animals from fine, aged wood shells. Brushbaby is definitely not alone. Yes the 400 is the most recorded snare, but that alone does not make it superior to all others, it simply makes it the most popular (note that the Honda Accord is currently the most popular car in the U.S).
Even precisely tuned, the 400 (and also the Dynasonic for that matter) still sounds like metal. I find them no substitue for a properly tuned, warmer-resonance wood snare. For some applications, I have actually prefered to use an old, MIJ luan snare (which I refurbished with Premier cast hoops, a modern strainer, and a Remo Renaisance batter) to my Supras or Dynasonics.
Guess it all depends on what your ear wants to hear for different types of music and what's appropriate in each application. My best sounding snare?... my 1976 3-ply 16x16 rope tension Premier.