The newest Massey rotary could be at the top of the pile I think. Why?
New rotor design is very much like the AFX in the Case, but it is much longer. So could potentially run everything more open and still get everything separated out (increasing capacity).
The new design cleaning system has an air blast between the concave and the grain pan. So lots of the fine stuff will never actually hit the grain pan but will be floated out the back of the machine on a curtain of air. Increasing cleaning capacity. I really think with all the different advancements in cleaning system design, looking for the biggest cleaning area really doesn't tell anyone who can clean the most anymore.
Undershot rotor feeding (still). It makes way more sense to feed into the bottom of the rotor flights (NH does this too) than to feed it directly into the front (case and deere). Try covering up your grain auger tube so you can only use the very end of the flighting! That is how a Case works. Easier on the crop, and a more even flow.
Reversible but mechanical driven rotor is the best of all worlds! I like that rad system. Fast unloading.
And I made all these observations without going to the farm show...
I would sure like to see a demo.
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