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I believe if you research this, you'll find ZF is preferred. Something about a particular aging mode the TRW/CAM racks exhibit resulting in asymmetric assist. No personal experience here, but given a choice, when the time comes, I would opt for the ZF.
Edit: One other reason I might opt for the ZF is I can change a boot without messing with toe-in or counting threads, since they fit over the outer ends. But that has little to do with performance or longevity.
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Art Benstein near Baltimore
When an actress saw her first strands of gray hair she thought she'd dye.
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