Hi,
The fastest method will not be in terms of scripting but in terms of drawcall if you are on mobile, on desktop and web, I doubt you will every see a difference. That will be especially true if you start to have 20 30 healthbar or similar stuff on screen, then you WILL need to use systems like 2d toolkit or SM2 to combine all the 2d gui into one draw call.
Actually that could be a good benchmark, taking Andrew system , using a lot more of playmaker, and custom actions.testing with a simply scene that keeps adding cubes with health bars and check perfs.
bye,
Jean