The short answer: A medium tone to a little darker than medium is probably your best bet, in an earth tone or gray.
Hiding dirt
Most carpet now is earth-toned or gray, or a variation of those two. Both are pretty good at hiding dirt. Obviously, the lighter you go, the more it's going to show dirt. On the flip side, if you get something super dark, you'll be able to see a lot of light-colored lint and things like that. A medium tone to a little darker than medium is probably your best bet for not showing dirt.
Wear
As far as wear, the main things are crushing and a dirty trail, or traffic pattern. Again, I would say medium to darker colors and earth tones are going to handle that best.
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