Cork or screw cap
Natural corks are particularly popular in Europe. On one hand, the wine can be controlled "breathe and mature" and on the other hand the cork seals very well.
Plastic corks have been used since the beginning 90s. So we had accumulated longer experiences. But until now it isn`t a substitute for the natural cork.
The screw cap as a "modern" bottle cap comes originally from Australia and New Zealand. It requires higher accuracy and effort in bottle production and filling to ensure the tightness of the screw cap. But it is easy to open and close the bottle.
Each type of closure has its advantages and disadvantages, which are controversially discussed by experts as well as consumers.
The natural cork can influence the wine and produce a cork taste
The plastic cork is made of polyethylene. It closed the bottle and a cork taste isn’t possible. But it is unclear whether the wine acid or other chemical substances trigger long-term reactions that change the taste.
The screw cap does not leave any taste marks, is easy to open and also close again
A capsules also closed a bottle and leaves no taste traces. But only young, cheap wines which are quickly consumed would be accepted with that.
At least winegrowers and consumers also provide different assessments about the "correct" bottle closure.