What's the best multivitamin?

I'm female, 18 years old, 5'2 1/2, 117 lbs. I eat 5-6 small meals a day and for the most part I eat a variety of foods, but as of late I'm focused more on protein. For the past 2 years I've been taking One-A-Day Teen Advantage for Her.

I only use a multivitamin as a way to ensure that if I do not get enough vitamins/minerals through natural sources (food), that it's a backup in a way.

So what's the best multivitamin? One-A-Day, Centrum, Naturemade, GNC, etc? Or does it not matter?
What's the best multivitamin?
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