Hi guys, if the question goes to which carty sounds better on a VPI JMW arm, give Mike at VPI a call. He'll give you good advice.
I use the Zephyr on my Classic. As I have mentioned many times before in other threads, IME, it's very compatible and sounds very good. I'm sure there are other carties costing tons more that sound better, e.g., Benz LPS ($5K), but for a grand, it's very good. No comment on the AT-OC9 -- never tried it.