I'd say the most efficient is Duncan but my favorite is Nowitzki. Garnett is A-OK but I dont like his style of play. If ever, I would take Duncan, but if my team already has a good Center, then I'd take Nowitzki. Garnett would be my last pick of the three. I will only pick Garnett if I have Lebron on my team. Hehehe..I think they will compliment each other.