To make sure we're talking about the correct knives, I've linked to each below:http://www.chefknivestogo.com/macdanakn7.htmlhttp://www.chefknivestogo.com/tojiro4.htmlhttp://www.chefknivestogo.com/ta6vekn.html
Is that correct? If not, my continued contribution could be seriously flawed.
Although there may be some differences between each of these, at the end of the day they are all going to be very similar. All use a core steel clad in either straight stainless or a stainless damascus. They likely all have similar geometry, so they will likely all cut similarly.
The biggest difference I see is going to be in the handle design with the Tojiro having the worst handle.
I've not specifically handled the Tamahagane or the Mac nakiri in question here, but I have handled others knives from both series as well as the Tojiro DP damascus nakiri.