Both Rice and Quinoa are healthy foods to eat so you can benefit from eating both Rice and Quinoa but if you're aiming to lose weight then Quinoa would be the much better option since Quinoa contains 40 less calories than rice does.
Overall between white rice and brown rice the brown rice is the healthiest rice.
Quinoa also contains 5 more grams of fiber and more protein than either white rice or brown rice too.