Honestly...neither.
Eating a balanced diet is the best way to get all the nutrients you need. Supplements are intended to supplement what you may be lacking in your diet and all nutrients are better absorbed when your body gets them from food.
Check out the new food pyramid at www.mypyramid.gov. It will actually give you a personalized pyramid, based on your gender, age, and level of physical activity. If you follow the dietary recommendations you should have the energy necessary and be consuming plenty of protein to maintain and build strong, healthy muscles.