GoPro Hero 4 v Nikon 1 AW1 ...which camera is best for snorkelling ?

Before buying an underwater camera for my snorkelling trips I was able to borrow a Nikon 1 AW1 and a GoPro Hero 4 to compare both cameras side by side, on trips to the Similan islands and Ko Phi Phi. This video shows some of the differences, and my opinions. Your opinion may well be different!
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