I am in general opposed to the use of statistics to determine which is the 'best' unit. I am much more in favour of intuitive decision-making, where the instincts of the commander are more important than statistics in determining how to make use of his army. I really don't see the point in endlessly trying to 'prove' the superiority of one troop type over the other. There is no 'best' unit type. There are 'best' unit types for certain situations. Naginata are best for holding a defensive line, Yari Samurai are best for stopping a cavalry charge, No-Dachi are best for flanking attacks etc.

The important thing is not knowing the precise statistics of every unit, but knowing how to use them in battle. After all, in battle you face an unpredictable opponent. All the statistics in the world won't help you win if your opponent has better tactics.