I have both, I have trouble getting accurate shots with my 72, probably just don't like the sights. I shoot better with the conversions because of the longer sight plane and I've shot and still shoot a lot of percussion revolvers and they have the same sight picture.
I never was into renactment or anything like that, I only shoot CAS at the local range. For me, I like to shoot and I love old machenery, the more complex and oddball and the more ingenuity and intricate workmanship the better. I know the reproductions have very little hand work, but the orginals were lavished with it and I can't affor the orginals.
The 72 was a good gun, but colt realy out did themselves with the conversions, especialy the 60 arm conversions with the rebated cylinder. Who'd thunk it would make a good cartrige gun?
Also from what I've seen I don't think the conversion lost any arbor threads, or threads in the frame, they milled the recoil shield down nearly to the threads, then steped the arbor to hold the conversion ring on when re-installed. Of course the 72's frame is solid and has more mass so it would follow that it's a slight bit stronger, and definatly less complex with fewer things to go wrong, but loaded with black powder and in 44 or 38 it dosen't need to be supper beefy.