Hi I've raced on a few different tires. The toughest performing seemed to be Maxxis Crossmarks. LUST if your riding tubeless. (tougher sidewalls) These questions comes up a bit in mtb circles so I did a little post on my blog about my favourite 3 tires. Mind you they are based on XC racing conditions
http://www.theworkingclasscyclist.co...op-3-xc-tires/
hope it helps