Bill,
I can only comment on the ZDZ 40 that I have. On the bench with half a gallon of gas throught it, running my own cut prop which is a copy of the Zinger Pro 20 x 10 , I was getting 7100 rpm, if this helps.
The only other case in point is a friend of mine that was using a 3W75 and was in need of another engine, so I told him to look into the ZDZ 80 (much cheaper on the pocket book), So reluctantly, he bought one.
He called me today to tell me he so impressed with it that he is selling his 3W75 for another ZDZ 80.
As far as longevity, BME, ZDZ, Taurus, 3W, DA, if run properly will last a very long time. So it does come down to performance and price. ZDZ wins hands down on this factor.

BMW are known to be very good engines and very expensive, but on the other hand a very ordinary Sunfire with its little 4 banger will get easily 200,000 miles out of it.