The other difference I've found between Ambassadors and Emperors is that I can generally get more volume out of Emperors. It's hard to describe, but with Ambs I reach a point where if I hit it harder, it doesn't get any louder. And I'm not a particularly hard hitter, but that's the main reason I usually go with 2-ply batter heads. They still have a fairly open sound like the Ambassadors. I may try Vintage Ambassadors next, I'm curious how they will sound.