OK. I'm going to play with the lens to eye level idea which means my lens needs to be level with my subjects eye level. I'm 5'-8" so for a subject that is standing since I'm taller then most women it is actually easier to use a WLF to take their portraits since I don't have to squat with a pentaprism. For men or women my exact height I would be better off using the pentaprism. For taller subjects than 5'-8" I'm just screwed unless I use a ladder.
Use what works for you. If you like using both finders then fine. I shoot mostly large format and digital. I do still own a Hasselblad 500cm with 80mm Planar and although I own both finders for it I prefer the WLF but that is just my preference.