It might depend on the idiom, jazz or classical. Too close to the end of the fingerboard has rosin dust tearing the skin off your fingers. Slightly further away from the bridge gives you a good driving jazz pizz if you pull across and down to the fingerboard as you release the string. Playing classically here (across and release upwards, like plucking a harp string) will produce a hard, knocking sound without much tone or sustain. As your "plucking point" moves towards the middle of the vibrating string length the sound will become warmer and project less. Move past this point towards your left hand and the sound will become brighter again with more sustain and a more pleasant mix of upper partials (more musical to my ears).
So, experiment with where you pizz in relation to the vibrating string length until you find the sound you want. I find myself mostly around the base of the neck for a pleasant mix of overtones, a feeling of elasticity in the string tension and a sound that projects well when playing in Half or First positions.
Two more observations. If you pluck at a harmonic point that harmonic will disappear from the sound, and, the longer the vibrating string the better sounding and sustained the note will be. Try plucking E flat in Half Position on the D string versus the same note on the A string (that might be preferred for arco because of its greater warmth of tone).
Best wishes,
DP
