For me it has to be the Merlin. Yes, you really can tell the difference between the DB601, the Merlin and the Griffon. 3 and 4 bladed Merlins also, but only if you really concentrate. It's not just the creamy smoothness of the noise, its the memories and history that is sent from the deep of your brain, every time you hear one flying past. Just wonderful. I used to love the afternoon JFK leaving from 27L while we were on T1 Stand 12 on turnaround long ago. A Typhoon or F16 turning tightly at an airshow, is music too, but nothing, nothing on earth, compares to the sound of silence, broken by the heavenly sound of a V12 Rolls Royce flying over.....