The best spinner needs to able to rip it, spin it and drift it. Keeping that in mind, I voted for Sri Lanka, India and Pakistan. I'll put England and Australia in the shelf below, and despite the success of our flat, containment-centric slow bowling success in the shorter formats, Bangladesh and West Indies below them. New Zealand, South Africa and Zimbabwe will fill the bottom shelf.
"O people, we created you from the same male and female, and rendered you distinct peoples and tribes, that you may recognize one another. The best among you in the sight of GOD is the most righteous. GOD is Omniscient, Cognizant." (49:13)