There are basically 3 types of Towbars.
Fixed ball Towbar - These are the standard and normally the cheapest. Does the job great.
Detachable - These look the neatest when not in use as they can be removed. Many newer dearer saloon car drivers choose these. However if you don�t remove them, somebody else might! theft can be a problem.
Retractable Towball - Look nice and convenient. These swivel out of the way when not in use leaving little or nothing to be seen. The swivel action may be manual or electrically driven.