Why not try the Seamaster 300m?
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Dressy yet has that sporty edge. Plus the blue edition is Titanium so you won't feel too much heft on your wrist. Only issue is that it will cost more than both of your choices.
But from the two you've mentioned I would go AT. It's more versatile and it can actually fit under a shirt cuff. I think the diver wears larger than the AT.
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