I honestly have no clue, i have wonder'd and moved back and forth between them as to who would win. I don't think GSP ever faced someone like Anderson, but the same can be said that Anderson never faced someone like GSP. I voted GSP, i think in cutting to 170 will make Silva a little weak and GSP will take advantage of it, i also think that no matter where this fight is at it will be competitive. GSP has, recently for some reason, underrated stand up, and ofcourse a great ground control game and submissions. Anderson's stand up needs no introduction but has underrated ground game. So on the feet it would be competitive, on the ground it would be competitive and i really hope this fight happens much more sooner rather than later.