I have both, used both a lot, and can honestly say BFMS wins. And here is why. It fills really well for a wax. Something at first wasn't looking for but after others mentioned it, I began to notice it really does fill pretty well and as a result produces tremendous gloss.
Fuzion is great, dont get me wrong, easy to use, looks great, but for me, I choose BFMS. :xyxthumbs: