I think that the two basically are two different approaches.
Gritty - A narrative choice made by the author or director where the unhappy results of the plot show.
Grittified - Where dirt is rubbed over everything whether it/they need it or not. An aesthetic choice. Has no bearing on the narrative.
Anyhow, I think that the grittified MacBeth looks aesthetically awful, as if the art director and the costumer had a fling, decided that they hated each other, and then both decided that they hated the director even more. The color grading muted out a majority of all colors. The cinemetographer tried, but he got handed a raw deal.