between 3710 & 5711. I think the issue will be between 3712 & 5711 - complicated Nautilus vs. simple Nautilus. Both of these watches are slim but the other represents the original case construction with complications and the other one is the simple basic Nautilus with modern three-parts case.
It is also interesting to compare RO 15202 to Nautilus 5711. The RO is the original Genta design of a sports watch and it is even slimmer than 5711. At the same time for me Nautilus represents a further development of RO design. It feels slimmer and this very elegant watch is water tight into 120 meters. In that respect a real sporting watch while RO 15202 is basically good for a shower.
By wearing a long time just RO and Nautilus I am trying to understand the watches deeper in order to really understand which one I love the most.
Best, Kari