The Mühle R41 would be my choice. Though it has indeed the same head as on the Merkur OC's it does have a better fit and finish as the Merkurs do. The lighter Mühle handle makes it better balanced too imo since the OC head is much lighter than the safety bar one. This all makes the shave better and more easygoing than with the Merkurs though not by much.
There is a little problem with comparing the rather mild R41 with the rather aggressive slant; the shaves are very different. So I don't really see why you would pick one or the other apart from curiosity.
Fact: the R41 would be the first razor I would buy again when all my razors would get lost.
I must to the barber's, monsieur, for methinks I am marvellous hairy about the face