Have had both, much prefer the throttle lock. The lock allows you take your hand off the throttle, flex it, trail it in the breeze, shake out a cramp, etc. Crampbuster allows you to loosen your grip. Throttle lock can be adjusted to still return, but allow less force and less grip to maintain throttle opening. Crampbuster still needs to be held steady to modulate speed. Throttle lock will need adjustments constantly unless the road is really flat. Crampbuster needs to rolled out of the way to not be in use, and is awkward to put in that position. Throttle lock can be disengaged easily-depending on style. I have the Kaoko lock, which I like because the lock/unlock feature works the same rotation as the throttle, i.e. rolling off throttle eases the lock feature, but not necessarily enough to completely disengage it.