Pull proccessing tri-x and t-max

Ive read that both tri-x and t-max give better results if you shoot them at ISO 200 or 320 instead of thier rated 400, then develope them for the normal 400 time. Is this true? Couldn't you also just shoot them at thier rated speed and just increase development to get the same results? What changes could I expect to see in my negatives by going this route? Thanks!!!

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