Flip tops can normally hold more pressure and easier to open , especially if filling above sea level and taking to the beach. Flip tops have a lot less incidents of losing the cap as it is attached.

cheers!

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There is not much of a difference.  Most breweries choose either a screwcap or a flip-top for aesthetic reasons.  For example, flip-tops are harder to print on, but many breweries prefer their classic look to the more generic screwcap look.  As far as keeping beer, they are roughly equal.

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