Sensor lenses is great from partly cloudy to flat light.
But for me, in truly bad flat light (middle of a storm) the Smith Yellow lenses is a little better for me. The difference is small. When skiing in a storm, I do routinely switch goggles with the yellow and sensor lenses just to get a dryer pair.
As Bushwacker said above the sensor lenses is good for a north facing mtn or the general low light you'll find in northern VT.