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The real-world question is rarely whether anyone needs the additional water resistance. It is whether the larger, more purposeful package feels better on the wrist. Enthusiasts who favor the replica Sea-Dweller often like that it is less common and more substantial than the Sub, while Submariner owners point to easier sizing and greater versatility. That makes the Sea-Dweller an interesting choice: technically it is the more capable diver, but emotionally its appeal may simply be that it isn't the Rolex diver everyone else chooses.