White rice has been milled with the outer layer where all the nutrients are located taken off. White rice is mostly carbs with less nutrional value. Here is a comparison I found on the web.
Brown Rice (one cup)/ White Rice (one cup)
Calories 232 /223
Protein 4.88 g /4.10 g
Carbohydrate 49.7 g /49.6 g
Fat 1.17 g /0.205 g
Dietary Fiber 3.32 g /0.74 g
Thiamin (B1) 0.176 g /0.223 g
Riboflavin (B2) 0.039 mg /0.021 mg
Niacin (B3) 2.730 mg /2.050 mg
Vitamin B6 0.294 mg /0.103 mg
Folacin 10 mcg /4.1 mcg
Vitamin E 1.4 mg /0.462 mg
Magnesium 72.2 mg /22.6 mg
Phosphorus 142 mg /57.4 mg
Potassium 137 mg /57.4 mg
Selenium 26 mg /19 mg
Zinc 1.05 mg /0.841 mg
That being said I still eat mostly white rice. If you are depending on your rice for your vitamins and nutrients you have bigger nutritional issues