The problem with the term "clean" is that every person will give you a different definition to what it means. To one person, a whole egg could be considered dirty while whole wheat bread would be considered clean. To another person, bacon would be considered clean while potatoes dirty. You get the point.
Why on earth would you have to choose between the two?
Do you go to make a meal and say "Hmmm, what's it gonna be 90g of cheese or a serving of whey?" LOL I hope not, anyways everything in moderation is fine. If it fits your macronutrient allotment there shouldn't be any harm.
Thanks. I have successfully introduced organ meat and I love it. Also quails eggs.
I was also told some types of cheese release/affect positively brain chemistry before bed. I had them on an empty stomach with raw vegetables and had nice dreams and a restful sleep. Whether placebo effect or fact, I don't know about that.