I have never used a ZYX, so I can't respond directly to your question. I did recently replace my DP-6 with 12" Red wand with a Triplanar VII.2 so I do have some idea of the differences between the two arms. The Triplanar has greater resolution and better dynamic contrasts. It is also much easier to adjust to get the best sound out of any cartridge. However, the Moerch also sounds very, very good. If you don't feel the need to adjust VTA too often, the Moerch can be very satisfying. Of course, the Moerch also has the flexibility of changing arm mass by changing arm wands.
Dave
Dave