Dunno if this has been addressed or not, but I'll share my experience between both. I find the Sanwa and Hayabusa to be equally as responsive, and both feel good. I don't notice any difference from a 'quality' standpoint.
However, one major difference I did notice that right out of the box, the Hayabusa feels much 'softer'. The stick feels very free. I notice much more tension on the Sanwa. This makes me prefer the Sanwa because I'm slightly more heavy handed when playing than most probably are, and I feel like I'm beating the Hayabusa to pieces unnecessarily. I also notice that holding one direction and releasing to neutral can cause the Hayabusa to snap back in the opposite direction and register a back input due to how 'loose' the stick feels.
For me that's something to consider. I think it comes down to preference, and even tho I prefer the Sanwa, I can't objectively say either is better. Both are great.
