In the seventies Australian Air Charters of Moorabbin had two Navajos with two bladed props. VH-RTO and VH-MBY. On the 3rd of November 1976 I had to perform a wheels up landing on the grass emergency strip due to a jammed gear door. Shut one down and levelled off the prop with the starter (not game to do it to both). So, one prop undamaged and one curled up like a banana. The undamaged one had ten hours left and the busted up one, was brand new. Story of my life, decision wise.
I liked the two blade props, and agree they were faster. Had slightly more of a growl and supposedly more vibration but it was hard to tell. MBY was subsequently fitted with three bladed props.