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I have played both of the horns you mention: Besson New Standard(B&H Imperial) baritone of 1950'-60's vintage and the late model SA Triumphonic (which I own). They both play similarly, though all things being equal, if I could get my hands on the Besson/B&H in near perfect condition, I would go with that. My Triumphonic is in fantastic condition and is built more ruggedly than the Besson, but it is smaller bore and has some intonation quirks in the 2nd partial that I don't like. The Besson has better response and better intonation, but they tend to be very well used whenever one appears.
Doug
Adams E3 0.60 Sterling bell - Prototype top sprung valves
Concord Band
Winchendon Winds
Townsend Military Band