and If I could I would keep both of them , but If I had to choose I would go with 1951.In this case (a square watch), its thinness is in my oppinion an asset ! as well as the simplicity of a dial. looks more noble. Not to take away from the compilations of 1952 but in my oppinion watch loving is not always only about how many features it has. What is important as well is overall feel to the watch , as to the strap, you change it anyway every six month and luxury straps are not hard to find. good luck decicing.
once again congrats on good taste.
regards
e