Brake fluid recommendations? Dot 3 VS dot 5

Kern Dog said

The only advantage that I see for DOT 5 is that it won't damage the paint.

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I might have misunderstood but I’ve read there’s some consideration between the two with moisture in mind… water displacement I’m assuming? I do live in the Midwest and it’s mighty cold, I certainly don’t PLAN to for the car to be out and about at negative temps, but it will spend its downtime during the winter in an insulated garage… would that be a concern with moisture in mind between dot 3 and dot 5?