Rava is the word that refers to the texture which is not a powder but granular. While the white rava is made from husked wheat and is white in color, samba rava is made from whole wheat. The samba ravai granules are slightly bigger than the white ravai. The white ravai is the same as the cream of wheat.
I prefer the samba rava for making upma but it is not readily available here in the US. I
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