Which watch on which rubber strap?

[Mr. Superlative]

I'm considering putting a rubber strap on either my Rolex Submariner (114060) OR my Sea-Dweller 4k (116600).

I love both watches, and would like to swap one bracelet for a rubber, purely for variety and versatility.

Which of the two watches do you think would look best with a rubber strap?

Also, should I go with the Rolex Oysterflex strap, or a third-party alternative, such as Everest bands?

Thanks in advance fellow TRF'ers.