I always use yellow and tinted.
The yellow is good when flying in white-out conditions which we have a lot of here in Greenland.
I agree with above if you fly much a night in birdstrike prone areas that a clear visor would be a good idea.
The yellow visor doesn´t really help much if there is no contrast at all, but if there is any little contrast the yellow will help to make it stand out more clearly.