The rumor that good wines only come with corks is slowly being dispelled. The purpose of a cork is to allow the wine to breath, meaning slowly receive oxygen for the aging process. If a wine wasn’t meant to age then a screw cap is probably a better seal. The Australian’s proved that the variation in oxygen in wines with screw caps after 10 years in the bottle were 5% while those wines with corks were 50%.
Read “wine knows” on moldy smells which comes from corks. This is another reason to go with screw caps. The best reason is you don’t need a cork screw and the bottle reseals very easily.