My Falken ZE-512 gives me awesome all-weather* grip, and for the most part, the tires are very quiet. My only gripe is that the tread wear on these guys are not the greatest. Falken only guarantees them for 50,000km, and given my first 7000km with the tires, I am not sure whether they will make it that far. Nevertheless, I wholeheartedly recommend them to anyone who is looking for some performance all-season tires.
I have no experience with the Kumho Ecsta ASX, so I can't comment on it.
*[edit] I should mention that I have yet to try them in the snow. However, dry and wet traction has always been superb.
-Rick