Organic vs. semi-skimmed milk: what's the difference?

I was checking out the nutrition facts, and it turns out that skim milk and whole milk both pack the same 120 mg of calcium per 100 ml. Obviously, the low-fat version is lower in calories.

So, which one is actually better for you? Does drinking the higher-fat milk offer any real health benefits, or is it all just about the flavor profile?

I accidentally filed this under Recreation and Fitness. If someone could just move it over to Health, that would be great.