More centered for classical, somewhat more spread for jazz. Really, a strong core with color ("spread") around that core in varying degrees, depending upon the changing demands of the musical context. There is no one sound that fits everywhere.
There is a lot of emotion and expressiveness that can be gained through the use of contrast between spread and centered tones, especially on tenor. You can really hear this in the later years of Coltrane's playing, which I think had a big impact on the modern conception of sax tone by many players.
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