I can tell you from my roughly 15 years of selling tools in this industry that it is hard to beat the Blue Max. We sell both of them, and I probably sell 10 Blue max to every 1 Orange Crush. The Blue Max just flat out works and it never leaves what I call erasure marks if you run it across a dry spot of film. The same cannot be said of other squeegee blades. Like I said, I can sell you either one, but that is my $.02.
Also, make sure you are buying the original and genuine Blue Max. If it is legit, it should have the Blue Max logo heat stamped into the top of the blade. Hope that helps.