My area is littered with embedded sharp edged rocks. Couple that with a rider that steers with the front and you get tire carnage. I've tried a variety tires over the last few years and here are my impressions. (what I mean by "slides well" is the tire will drift controllably and not suddenly lose traction)
Metzeler MC4
Chunks in rocks, very good on a wide variety of surfaces, collects mud and it won’t sling off, doesn't slide well
Michelin S12
Chunks badly in rocks, squirrely on hard surfaces, great in mud and sand, very good on other surfaces, does not slide well
Michelin M12
Chunks in rocks and the carcass cuts easily, poor in mud and sand, pretty good on other surfaces, does not slide well
Dunlop D756
Does not chunk, but wears quickly, very good performance on all surfaces when the tire is sharp, slides well
IRC VE35
Tough tire - very good wear, equally poor performance on any surface
Pirelli MT83
Chucks badly in rocks, adequate sand performance, very good on all other surfaces, slides pretty well
Pirelli MT44
Disintegrates in rocks, very good performance on all surfaces, slides pretty well
Bridgestone M201
Wears well, talc-like dust and deep mud are the only surfaces this tire has a problem with, slides pretty well
Bridgestone M401A
Chunks in rocks, works well on most surfaces, does not slide well