There are 3 styles
1) T handle w/ removable crossbar (or use extension without crossbar). Still very popular, snap on, hazet, stahlwille and most german makes use these. Modern facom crossbars are not removable.
2) The Cman, Motion pro, and Sunex type spinner handles with square drive and sleeve. PB swiss and Facom make some alternate versions for hex and bit use.
3) T-handles with universal joint (square drive). The toptul is shown above, and Beta, Facom and USAG all do varations on this.
The benefit of each style is evident in different uses.
Applicatiosn like moto use the t-handle form factor alot because of the lack of spatial constraints and the multitude of small, low-torque fasterners which makes power tools verboten. The spinner and the universal style in one piece is nice because its stiffer, faster, and less likely to excess yaw angle or slop, and also applies torque better and less like a torque stick. The type that breaks down is usually found in generic/portable-type toolkits for occastional or mobile use where there is an advantage to that type.
Horses for courses, of course.
