In addition, the Classico is much more dressy than the Marine (sportier style - definitely an UN choice I suppose) with a case size easiest to wear at least for me.
The difference of indexes' thickness has a great importance in my choice too. To conclude, I particularly love the drawings (waves) and blue colour of the dial. It makes me think to a sunbeam which passes through the sea and creates wonderful hues when you are under the water.
Modern crab lugs and a deep blue dial with subtle waves. The DNA of UN and its link with the sea is well summarised here IMHO.
Best wishes
Alkiro