They're both great, but since you're looking for an opinion, I strongly prefer the classic blue on the 5711. I think it has one of the most beautiful, interesting faces around. As people often mention, it takes on distinctly different personalities in different light, and you lose that some with the white face. I actually prefer the royal oak in white, I think.
Having said that, I think the white face is a better match on the nautilus models with more complications (5980, 5726, etc.) I haven't seen one in person, but the 5726 in white looks pretty stunning in photos.
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