The Michelin comp 3 & 4 were designed for the WEC in Europe & now North America. They are designed to be good all round tyres including on rocks which feature quite heavily in the WEC when it visits places such as Greece, Italy, Spain etc. They also have to cope with wet forests and grass MX tests as stated. But don't forget cross country tests and extreme tests also feature. There may be more specialist tyres that will excel in one particular terrain but the FIM enduro tyres should provide a great all round trail tyre.
If wet roots and rocks really are the thing you should try a trials tyre on the rear it will provide amazing grip compared to a nobbly. Bit interesting on wet grass or surface mud cornering though as they let go very suddenly when they reach a particular angle..
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