No compromises "win STS" tire? Probably the Azenis. MX being a close second, maybe even a tie. (though I've never actually driven on the MX, just going on what I've heard)

But, if street and wear characteristics come into play... the Goodyear F1 (GS-D3) is the absolute best tire I ever had on my car. Outstanding dry grip, great steering response, comfortable rather than harsh like the Azenis... and unbelievable in the rain.

Dunno about the MX, but the Falken's lose their rain ability by the time they get to half-tread. I had the F1's down to below half-tread (several autocrosses and two drivers at the Primus track event put lots of wear on them quickly) and their wet performance and really every aspect of their performance was unchanged.

So, it comes down to whether you're running the same tires on the street and what your priorities are.

Something else to consider... Azenis are heavy. Something close to 21 pounds in the 205/50-15, I believe. My 195/50 F1's were 19 pounds... that makes a difference on a lightweight and underpowered car.