Correct AJ. They are different designs however tonality and harmonics are the most important factor to my decision. The Rethm goes down to 18HZ uses a 7.5 inch crossoverless design.
The Analysis Omega goes down to 20HZ which is an amazing feat for a planar. I prefer the openness and size offered by the ribbon tweeter over the single driver however prefer the tonality of the single driver.
Soundstage size goes to the planar but imaging goes to the Rethm. Bass integration is excellent with both designs. Dynamics goes to the Omega however transparency goes to the Rethm. Focus as well to Rethm.
Bigger is not better. Better is better. Tonality first, harmonic structure second, focus third, transparency last but not least. The Omega is limited to amps where the Rethm is open to more choices.
Without getting into the science of each design with there design merits or faults the only thing to do is actually put them side by side and listen.
charles