I have KM3's on the FJ40 and KO2s on the Taco. They both seem to be holding up better than the KM2's and KO's they replaced.
The FJ40 has 35's and the Taco has 33's, but I can't really tell much difference between them as far as traction on dry rocks and sand.
On wet rocks the KO2's definitely grip better and I have slid the FJ40 several times on wet rocks.
Mud advantage definitely goes to the KM3's with their wider blocks. Sticky red mud turns both tires into racing slicks, but the KM3's will clean out faster.
Neither do particularly well on ice & snow.
I drive further on pavement in the Taco, and the KO2's are much nicer on pavement and I doubt I would ever go back to mud tires on it.
I ran KO's on the FJ40 for a few months and it just doesn't look right to me without mud tires.
In the end I like both tires and will keep the KM3's on the FJ40 and KO2's on the Taco.