Fuzzies definately have more nutritional value because they have more developed skeletons (more calcium), and more muscle than a pinkie would have (more protein).
However, pinkies are digested MUCH faster (they're easier to digest because they're mainly fatty stuff with nothing hard to digest, sorta like a McDonalds hamburger).
If I were you, I'd just stick to what your snake can handle properly, don't rush growth by over feeding or you'll end up with a dwarfed snake from regurges.
-13mur 6