I personally liked the Razor HDs over Maven B2s. Not a large enough difference in glass quality (at least to my eyes) to justify the significantly larger and heavier mavens. Not sure what it was, whether difference in the prism system used or what, but the mavens also made me feel like I was going cross eyed ( and yes, I do know how to use a diopter to adjust, still didn't make a difference).
Both really solid binos tho, both made in Japan, both similar price. Really seems like a personal preference thing to me.