After seeing these shots, I'm now in the camp that would pull the trigger on the 47mm. They are both very workable IMO, but at their worst, the 47mm might be a tad on the large size, whereas the 42mm is a bit on the small side. Both look fine to me, but with more of the submersible DNA apparent in the 47mm i'd definitely go with that if I were you and if it were between the 2.
Enjoy!
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