The free-standing pipe bender is used to bend longer or thicker piping which requires more force.
It has a free-standing base and a long handle which allows more pressure to be put on the pipe without extra force from the user.
Ratchet pipe bender
The ratchet pipe bender has a ratchet handle which slowly pushes upwards, pushing the pipe to bend between two blocks. This bender is more compact so can be used easily in small spaces and its ratchet mechanism means that it requires less effort from the user to bend the pipe. For more information see: Ratchet pipe bender
Conduit pipe bender
The conduit bender is designed specifically for conduit piping.
It only has one handle and uses the floor as extra leverage, as conduit piping (electrical piping) is generally smaller than most plumbing piping so requires less strength and force to bend it.