There are many set-up variations for both classical and jazz players. To generalize, classical players need more arch in the fingerboard, which helps with clean arco string crossings. Most jazz players like the board a little flatter in the arch, which makes it easier to cross strings pizzicato. When strings are set high, and the bass is to be bowed, a lot of fingerboard and bridge arch is required, and the strings may need to be spaced farther apart. That's because when you press an individual string to the fingerboard you move it down a lot compared to its adjacent strings. This makes bowing cleanly on one string very difficult. As far as camber (longitudinal scoop), gut strings need more. Players who pluck hard generally need more. Players who fire the strings downward (plucking finger toward the bass' belly) need more. A flattish arch is good for finesse players and easy-going bowers, also classical soloists. These are all generalizations; every player needs something a little bit different.
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