Personally I think the difference is superficial. My 1995 Submariner (mine is a 75090, big watches weren't exactly the thing back then) is still running within COSC despite it's only been serviced twice in the 25 years I've had it since new. Casework, bracelet, dial, hands are probably of equal quality anyways. So if accuracy, robustness of the movements are almost equal I just don't see that much difference in them.
But at the end of the day, Rolex will always be the big brother.
