I have owned all three, the Weaver, PST and NF NXS, F1's and now the ATACR. My views are those of a tactical/police sniper with 48 year old eyes who does a lot of field work and sticks a bolt gun in the trunk of the cruiser 40+ hours a week. If you do bench shooting or just range work my observations may differ based on the type of use/shooting. So with that said I will give you my observations, but I am NO expert.
Weaver: started out as a great $700 pick up. The glass was very nice, the reticle was useable and it seemed to track well. I even like the illumination for a lower end scope and I normally hate illumination on any lesser (under $1500) scope. Now the bad.... it did not hold up to hard field work and the warranty. I had an issue with the windage turret not catching. It took multiple phone calls and months to get it sent and returned. In the meantime I picked up a PST to use on my back up rifle. After the Weaver returned it went back into use and three months later I had another problem. This time armed with the right POC I figured a phone call and I would get the issued fixed. Well, it was the same run around and once the Weaver gets back (it had been two months) I will sell it off, with warnings attached, or stick it in my safe for use on a future .22 trainer.
Vortex PST: I went into this scope as a quick easy cheep fix so I didn't have to pony up $1500-$2000 for another NF or $2500 for another USO. I didn't expect much but was happy with what I got for the money. The glass is below the Weaver but the reticle was much better. Although not a true zero stop I did like the shims system and the scope tracks well and held up. The problem was the illumination. I do use it a bit when tracking targets on dark back grounds and did not like it as much as the Weaver. About six months in the illumination ceased to function and I sent it in and had it back in 9 days. Nice CS, BUT the lesser glass and other issues led me to sell it off with the rifle it was on.
NF NXS: I love the NXS and have had zero issues, ever. I hear about the glass not on par with the big guys (a problem resolved on the ATACR for sure) but I base glass more on eye fatigue and ability to find contrasting objects. Not a glass expert but when I look through a cheep scope (Barska etc.) my eyes tire quickly and I just do not pick up the contrast of objects in the field. Everything kind of blends and I miss visual ques. I never have this problem with my NXS. I still have my very first NXS and it has seen serious use and has never failed me. Can't find a thing I don't like so this scope is in MHO GTG!
NF F1: I jumped on the FFP bandwagon and spent up for the F1. It is everything the NXS is and the glass has even more of a visual pop to it then the NXS. Not sure if they use different coatings or different glass but it was a great scope. The only reason I sold it was to fund the ATACR and our team uses MOA not Mils so the whole FFP/Mil thing was not a big deal for the type of work we do. For a different style shooting this would be a GREAT pick up and light years above the Weaver or PST.
NF ATACR: I bring this scope up even though its twice the price because it is 2X the scope the Weaver and PST are. It is worth every penny and is my go to scope for all applications. The field of view is excellent and even setting up at 20 yards the other day I still had enough of a FOV and no parallax issues. The glass is just a joy to look through, equal to my USO, and it is flawless in construction. A tad big and heavy but can you say ROBUST! I also love the MOAR reticle and even though it is a SFP scope for most applications that should not be an issue.
So IF it were my money I would reach for the NXS. There are used NF's here on the hide at excellent prices and a NF WILL hold its value and last a lifetime. You may not need to bump up to HS turrets or ZS so that makes it even more affordable. If you really want something you will hold dear for a lifetime then save up for the ATACR and have all the glass you will need for virtually any shooting application.
Sully