I am just about at the end of the life of my current set of Maxxis ITs on the KX500. Here in Southern California, they have been on single track, trails, fire roads, rocks, sand, a bit of pavement, and rocks. Did I mention the rocks?
They replaced a set of Dunolps and both gave about the same performance.
My son's KDX220 got Dunlops at the same time I put on the Maxxis.
He rode exactly the same places, but did not have the same wheelspin style as the 500.
Side-by-side, they both look and performed the same. He claims to have some knobs cracking, but I'll have to inspect.
Bottom line...I'll go with whichever one is the best sale price.
If I can find a decent sale price, I am going to try the MT43 Trials on the rear of the KDX this time. I don't think it will work the same on the 500, though.