Will Tri-x in Rodinal at EI 250 give noticably better results than EI 400?

I would like to experiment with developing Tri-X in Rodinal 1 + 100, and I have the data for doing this at EI 400 and also at EI 250. My question is: would there be a noticable improvement in visual quality at the lower of these two speeds? If so, what specific improvements should I expect to see at the lower rating?

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