prom dress ??

i'm going to prom as a sophomore this year with a junior, so what dress looks the best ? i'm holding stuff in the back bc i didn't have anyone to secure it for me. but i bought the white but may return it. the only reason i like the white and not the blue is because my school color is blue and everyone will have that color ! and i have two more years to be more fancy. opinions? should i exchange for one of the others? thanks !