OK let's clarify this. I just looked at two of my AR's, both are Bushies.
My Post ban bushy with the telestyled stock is the newer ribbed "M4" stock. It has 4 rectangular holes on now side and three smaller rectangular "cut outs" (lacking a better description) on the other. These are not stakes. For this type of retaining ring, the newer 3 toothed wrench will probably work better, allowing you to apply your energy to more or the ring.
My other Bushy is a Pre ban with the older type "CAR" telestock. It's ring only has one round hole in the middle of the ring, in which case the wrench with one tooth will work fine for this type of stock.
Again, in either case, the older wrench will work on both types, but with the newer ring, the newer wrench will be more effective.