Here are some older threads about tread choices and the differences between them:
Here
Here
Here
Here
Quote:
Originally Posted by Oblarg
Wedgetop has extremely high COF, but it is only available in soft gum rubber or black SBR. The former has less-than-stellar wear characteristics. Don't know much about the latter.
Roughtop doesn't grip quite as well as wedgetop, but is available in blue nitrile which has better wear characteristics.
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Are you sure you don't have them opposite? I have always heard that roughtop gripped better and had a higher CoF than wedgetop.