As a good melodic flow,
that's just a rhythmical ranking as political marketing by Rikyu's school (I'm not sure he himself wanted though...).
Considering for each of those scenic design of his favor ("wabi") and convenient disposition in use,
hagi would be the most well-balanced chawan as utility article in this thought.
So, how about "One for the koryo, two for the choson, three for the hagi as longing with respect."?
No. "One for koryo, two for Koryo, and three for Koryo." (Isn't it? Walter!).
It's totally depends on what kind of equipment you are ready for what kind of style for the occasion,
like for waves or whatever as you know...