Both nice rods... Probably can't miss with either one.
Weight and Swing Weight - Advantage Zenith. I really like my NRX #6, but it definitely has a heavier physical weight and swing weight than the Zenith. The Sage One beats them both by a mile though in this category.
Short Distance - Advantage NRX - softer tip, more feel. Zenith isn't nearly as versatile, IMO.
Long Distance - Tie - Both will fire it out there with authority. (Note: Sage One has more long range power than either).
I personally love the cork on the NRX rods, it is an old growth, firmer style cork, with lots of figure, different than the vanilla cork on many other rods.
G. Loomis Made in USA - Hardy rod built in Korea. Doesn't mean anything to some, but is a factor for many of us.
For me, it is easy NRX... by a nose.