Is that a trick question?
Oh wait, IT IS. Because i couldn't hear GS150 unless i paid close attention
The sound stroke difference between both GS150 and Piaggio is very minor, but GS150 sounds tad better at higher RPMs (or maybe its just me).
But again, the Sound Stroke is no way close to Deluxe.
I was confused when Gull Bhai said the sound is Disturbing. Because Rider ko wo sound sunayi nahin deta jo aas paas k logon ko sunayi deta hay. If you follow this thinking, then sound is more disturbing to people around instead of the rider But its not the case, because it indeed sounds pleasant.