I learnt that the quietness depends on the motor/oil combination and not on the oil alone. That said, the following order in 5W-30 synthetic flavor seem to reflect the collective opinion on most to least quietness on different motors.
1) Amsoil / Pennzoil
2) Castrol / Valvoline
3) Mobil 1
1) Amsoil / Pennzoil
2) Castrol / Valvoline
3) Mobil 1