Obviously tungsten sinks much quicker than brass, but I disagree that it necessarily translates into more fish caught - in and of itself. There are many other important variables to consider.
I probably have an equal amount of brass and tungsten in my box. Maybe it's me, but I have never noticed that I catch more with one over the other. I know for sure that I have never left the river saying, "Dang, I should've used the tungsten today."