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required torque is 40nm which sounds excessive to me!!.....not sure how you do that accurately with the spanner type tool ! ...............it is however less than half the price of the socket type whose primary role is as a BB tool.
I guess someone who blocks me has already replied to tell you it's the blue tool. As for whether a socket and torque wrench or the flat ring spanner is best. I honestly wouldn't worry. Even at the correct torque centre lock rotors have a tendency to come loose. And once they have, the splined interface tolerance is never quite as good anymore and from then on they have even more of a tendency to come loose again.
It's kind of a terrible system.
Unless for some reason you remove and refit rotors a lot. Or really think you need whatever latest Shimano ice tech technology is being touted good old 6 bolt is a far better solution.