I made some basic observations of the bottles and caps/corks used for
different types of bottles. For wine/champagne/sparkling juice:
-The average bottle of wine has a simple cork that requires an opener.
-Jugs of bargain wine usually have wide and tight metal screw caps.
-Some cheap wines have little metal screw caps that are similar to the
ones on large beer bottles.
-Some pop wines have hard screw caps that are similar to the ones on most
liquor bottles.

For liquor:
-Most liquor bottles are sealed with hard plastic screw caps, which seem
to be the tightest and quickest to open and close.
-Some liquor bottles are sealed with wooden corks with flat plastic tops
connected to them.
-Other liquor bottles are sealed with flexible metal screw caps that can
be more difficult to tighten and/or align properly.

Questions:

Is a specific type of cap more efficient than a good cork?

Why isn't one type of cork/cap used as a standard for bottles that contain
non-carbonated beverages? (Are the different styles of caps and corks used
for purposes other than cutting costs or marketing?)