Well two of my pinkies are larger than one of my fuzzies, so I felt like it would be counterproductive to feed two pinkies. Plus one larger prey item has a better meat to skin ratio and I believe that a fuzzy has better formed bones, which would be better calcium. These are just my thoughts and like I said, most people have no problem feeding two pinkies.
My preferred feeding schedule is small pinky, large pinky, peach fuzzy, regular fuzzy, etc. So it's a gradual progression up.