comparing different types of rices?!

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The rice grain is generally white and the smaller colour variations don't affect the nutrition in any way. The compositional difference between different types of rice (long grain, short grain, rissotto, basmati and so on) are negligable as well.
Brown and black rice are only those colours because the outer coating of the grain is left intact rather than being removed. In this case there will be some differences - the outer coating is mainly fibre but does contain a little rice bran oil which has good nutritional properties and there may be some useful minerals and possibly even vitamins

Wild rice. Other than that you have the different types of white rice, risotto rice, basmati rice etc.

yellow