honestly, I'm not sure. I've seen studies both saying egg yolks are high in cholestrol, and I've seen studies refuting that claim. considering the levels I ingest, I figured better safe than sorry (and cheaper 12 dozen eggs = 750ml of egg whites. crazy!) and just went with the egg whites.
egg yolks ARE high in cholesterol. But AFAIK the data is leaning towards the fact that our bodies recognize extra dietary cholesterol, and doesn't synthesize as much to compensate.