No question in my mind the conversion is the way to go.
Correct me if I'm wrong, but didn't the racing department invent it when they needed reliability for bikes that would be ridden hard?
Personal experience tells me it's far better too. I had mine done nearly thirty years ago, and the bottom end has been apart just once since. It's no hobby bike either, I have no other form of transport.
Granted I spoil it rotten with oil changes, but it's the best money I ever spent. 41 years, same bike, same rider, 13 without the conversion the rest with, along with the S.R.M oil pump and oil pressure relief valve I'd do it again if it was twice the price it is.
I'd be interested to hear the bad endings Black Sheep has come across concerning the conversion?