I subscribe to go to the back of the hand for many things. Personally, I use a 2nd finger fulcrum mostly, but i know some guys who use the ring finger.
Basically gripping with the pinky always tight, the Spivack way is usable for some things. As mentioned Tony generally used it. To me it helps with certain types of hi-hat work, like if you try to do something fast onehanded like e.g. what Tony did on "Fred" it might help with your control.
You can use whatever fulcrum you want, really. If it works for what you want to do and you find the balance on the stick, then it works.
Offcourse, if you play many different kinds of stuff, you probalby don't use one static grip or movement for everything.