I preseume white is the best, signifying purity.
White - good Saruman (purity)
Grey - Gandalf (white sullied by hard work?)
Blue - Pallando/Alatar (dunno but Manwe's robes are blue, sky =freedom perhaps)
Brown - Radagast (nature)
Thats my guess but feel free to disagree (hey that rhyms (sp)) wow!
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