I love a) sherry bottle closures: a cork plus a top you grab with your bare hand; a twist, a pull and voilà!
As opposed to: b) regular wine bottle cork, with all the associated paraphernalia and ceremony.
Has anybody ever seen a wine with a) (or, for that matter, a sherry with b) ) ?
NOTA BENE: please leave out, for the sake of this discussion, screw caps, plastics, and mutations thereof. Cork is cork.