Depends on what you are using it for? for benchrest punching paper only, the Nightforce would be better but for hunting in low light conditions, the Zies is worlds better.
Most deer hunting is at dusk and dawn, plenty of light most of the time, but that deer or elk across the field in those dark woods that sometimes you can not make out the rack count or if a branch is going to deflect the bullet can be a loss. . the Zies will destroy the Nightforce in those real life hunting where you need more light gathering so to speak.
,, the Zies is better in low light.
for coyote hunting
that 99.999999% of the time at dusk/dawn or low light the Zies will be better.
This is not to say a Nightforce is as poor as a Simmons scope, they in my mind are superior to Leupold for durability and slightly for optics.
For paper punching in the daytime, or day hunting none is better than nightforce
Low end 3-12x56mm and 6-20-50mm Zies are not cheap, like $1000.. and are assembled in America with Geman glass.
, the high end Zies stuff is $2500 and made in Germany, the 6-24-56mm high end is like $3500, and the huge 6-24x72mm (34mm tube) is $3700
Actually the 56mm Nightforce at $1800 is cheaper than a high end Zies with a 56mm, about double the price.
Personally i'd buy a $1800 Nightforce over a $3500 Zies and just go home from the Coyote hunt 1/2 hour early. $3500 to me is a lot of money for optics.
For 1000 yarsds, the moa adjustment on the nightforce will be better, but they do make 20 deg moa bases to help poor moa scopes
Moa Adjustments, and tank construction = Nightforce
But German glass is so much superior to mediocre poor American and Japanese glass, it is not close.