For me, that is easy. The original Ping putter (can be seen at http://www.pinggolf.com/putters_classics.html, in the upper right corner of the page.) made the most noise. It had a distinctive "ping" when hit. Hence the name of Karsten Solheim's company, PING. The new replica putter is close in sound but not quite. The original series of putters Karsten built in his garage in Scottsdale, Arizona all had that distinctive sound.