It depends on where you like to ride. Where we go, rocks are the problem. We seldom get mud. I've been running these Sedona Ripsaws for a couple years and love them for rocks. The rubber blocks are close together to keep sharp rocks from getting through. There's also a lot of rubber to wear out.

[Linked Image from i.b5z.net]

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.