The NXS has long track record, including military service. It is an SFP so to range with the reticle you need to turn up the magnification all the way. Not a big deal, it even has a marker on the eye piece.
The SHV F1 has only been out for about a year. It was originally released as a SFP, but NF responded to shooters and made an FFP version. That lets you range with the reticle at any magnification. The F1 is just over $1200 new. It has the Zero Stop, it not an option like on the NXS. Sorry if I went into basics, but not knowing your background in shooting, I didn want to mislead you.
Not knowing anything about you, your equipment, and I don't know much about hunting, it hard to say. Budget wise NXS is almost double the cost SHV F1. A used NXS is any where between $1300 - $1700. There are differences in options on the NXS, high speed turrets and zero stop.
My NXS has HS and Zero Stop. The benefits to Zero Stop you don't loose your zero when dialing back down. I shoot regularly from 600 and 1000 yards, you can see why the stop is important for me. The glass on both is clear enough that shooting even in lower light should not an issue. Your best option is to get your hands on both scopes and look threw them, play with the turrets and see which fits your requirements. If you have specific questions PM me and I will help you.
If you search on line you will find info oon how to test your scope ability to adjust and return to zero, by perform a box test. Brian Lutz has a video on how to confirm your scope is level, which is very important at longer distances. Also consider using a 20moa rail to mount your scope. Do not short change yourself on rings or a mount. Plan on spending $150 or more for a good set of rings. Measure and get the correct ring height for your gun. You what to keep that scope as close to the bore of the barrel as possible. This will also help you with you stock fit. Since the higher the scope the higher you need the stock comb.