First off, I just got done watching film on these 2 and here is my take based on what I saw. Both have electric speed in the open field. I think Best is quicker, meaning he gets to top speed faster and maintains his speed even when he has to cut. I was suprised at how well Spiller ran inside. Both seem to catch the ball out of the backfield well. Spiller showed decent pass block ability, where as I did not see Best even attempt a pass block. Both seem to have good vision, I would give the edge to Spiller on the inside, but Best in the open field. I saw Spiller run into tackles or his own guys far too much in the open field. I think Spiller and Best are both great in the return game, slight edge to Spiller only because I saw more of it from him. For me, if Best checks out medically, I think his value as a trade up in the 2nd would be better than Spiller who will be a trade up in the 1st. Thoughts?