Only the heavier gun is an advantage. The two 20mm flak guns are better for air defense IMO, but the 37mm gun can be used against lighter shipping. The single barrel 37mm isn't much good against aircraft IMO due to the low rate of fire. Different configs won't have any effect on spotting ability IMO. Anytime you have the guns manned your spotting ability is less than if you have the watch crew stationed.
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What? Behind the rabbit?
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