http://www.genuineideas.com/ArticlesIndex/rest.html
So its a tie. Besides, in the real world meat is always consumed somewhere between these two extremes. Its takes (or should take, if you remember to chew each bite 10 times like your mom taught) a half-hour to eat a steak, which means the last bite is fully rested, even if you started slicing the first off on the grill.
Finally, not salting meat a half hour before grilling is a crime against nature- it adds flavor and nearly doubles the retained juices. Not resting the meat before slicing is a choice that barely affects the tenderness or juiciness of your meal- feel free to be creative.
This is my case. Bring me a hot steak and I'll let it rest on my plate if I prefer or eat it hot and juicy if I prefer. And sop up the plate with a biscuit if I prefer. There is no right or wrong here.