I completely agree with your entire statement. I've bought both watch brands, but completely different styles. The Ulysse Nardin Maxi Diver and the Blancpain perpetual chronograph. I bought both at extreme discounts, greater then 50%. I sold the Blancpain, but still have the Maxi Diver, that being said, as a watch manufacturer I believe Blancpain to be slightly superior. You didn't mention which model you are considering in each brand which could be a deciding factor too.
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One of my all time favorite vintage Blancpain watch is the fifty fathoms which they make a current model today, but I prefer the vintage look...
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