This article is from the WineMaking FAQ, by malak@CAM.ORG (Don Buchan) with numerous contributions by others.
Many styles of corkers exist and each can have advantages and
Hand corkers: "Hammer" style corkers are the type in which you put the
cork into a constricted neck and using a plunger and mallet, you force
the cork through. Usually this is the cheapest style and may have
wildly varying results. "Plunger" style corkers are better and use the
principle of a lever to compress the cork using wrist action. A plunger
operated by your free hand pushes the cork into the bottle. Very
reliable but only recommended if you're making little wine or need it
for small bottles.
Table corkers: The corker is attached to a table and compresses the
cork either similar in style to the "plunger" style or differently and
uses a lever to force the cork into the bottle.
Floor corkers: Identical to table corkers, but whose base is on the