2 answers
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!Add comment
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.