The BX100's over-provisioning helps it perform a little better than the 512GB Reactor. The difference is small, but the edge does go to Crucial.
Both products would benefit from advanced caching algorithms like SanDisk's nCache (found in the Ultra II SSD). Micron recently announced tools available to third parties that work with L95B FortisFlash, but the Reactor shipped before those tools were available. pSLC cache mainly increases random write speed, but also has a slight positive effect on random read performance.