I've currently got Pirelli Scorpion MS on front. Pretty happy with it - it replaced the original Michelin enduro comp which was OK in the grassy stuff but not on wet clay. On the rear now have Bridgestone M404 which is going well. Did have a scorpion which replaced original as per front - The original tyre sizing was weird - the front was too small and the rear was huge. Handling improved when I ditched those. The rear scorpion I didn't like - seemed a lot of sideways slip. Anyway I killed it with too little pressure - it developed diagonal "waves" in the side walls, and when I pulled it off heaps of the cords were floating around loose inside.
"How much pressure have you been running?" said the guy at cycletreads.
"Same as I always have" I said. "Let it down till it looks flat , then let some more out" I said.
"Wanker" he said.
" I can ride past guys who are stuck" I said.
"Wanker" he said.
After handing over many, many dollars for the new tyre, I now agree with him. I now run super high pressures - 10 maybe even 12 psi. ( no wonder every body gets stuck and falls off, I say (to myself)).