Hell, if it's the number of notes and different voices at once that you want, how about the organ? In the right hands (and feet) it can be very expressive. I still vote for the cello, though.
I think it's down to the musician, not the instrument.
Most wind instruments can't be polyphonic, and most stringed instruments (and I'm including piano) can't be anywhere near as expressive on simple music as a wind instrument.
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