[Oblarg]

There's no universal standard for what constitutes "best tread." Like anything else in engineering, the best solution depends on what you're trying to optimize.

From the research I've done, it seems that of the common FRC tread solutions (note: none of this is from my own testing and I cannot verify any of it - this is merely a compilation of stuff that I've read, mostly from memory, and if I'm wrong on any of it feel free to call me out):

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.

Colsons have fantastic wear characteristics but do not grip as well as plaction. Some teams cut patterns into their Colson wheels to improve traction - I have not seen anything on the effects of this either on COF or wear characteristics.

VersaWheel 'W'-pattern treads have an extremely high COF but wear very quickly.

VersaWheel DT's wear better than the 'W' tread (but not as well as the Colsons), but do not grip quite as well. COF is comparable to Colson wheels.

AndyMark HiGrip wheels are similar to VersaWheel DT's in wear characteristics and grip.