One thing I think is helpful in Wavelab is the ability to be able to zoom to the fade curve by clicking on ‘zoom to fade range’ in the fade ribbon. This along with the other functions in the fade ribbon and envelope points gives some pretty sophisticated control of the fade curves which you can see in fine detail.
And worth mentioning: the Wave Matching Tool Window, which I think is pretty unique to WaveLab to create phased-sync xfades.