The Karoo gives *very* good traction off road (on an XT600 3AJ) but wears very quickly on asphalt (my front lasted about 4500 miles, 50/50 road/offroad). Is also poorly balanced and vibey. I was disappointed - mine also cut quite badly on shale and flint, and big chunks went missing!
Have never used MT21. Sorry! My TKC80 Twinduros are very good on road and also give great`traction in moderate (dry) off-road, although for extreme riding the Karoo would be better. In 1000 miles (70% road) the Twinduros are only very slightly worn.
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