The more I try and choose between the two, the more I feel like I need both! It's a tough choice since I prefer the design of the 15202 more, but the 15500 rep is considered to be built to a higher standard. Although the slim case of the 15202 seems better than the 15500, I've had no issues with 42mm AP RO chronos and ROOs, so I wonder if it'll really make all that much difference to me on the wrist. Again, I really need to have them both to find out I guess.