Re: what is the most popular NF scope?
Being somewhat of a magnification whore, I wanted the most magnification I can have with at least 80-100 MOA adjustmnt - that leaves the 5-22 (I got the 56mm obj.) right in my zone. I went NPR1/MOA turrets, and I shoot it at max power 99% of the time on my .50, which is where it subtends correctly-but yes would prefer FFP.
I like the 5-22 even if it was on my "daily shooter", and I like the bigger objective's light-gathering advantage - even if it is only slight.
However, if you don't "need" that much magnification, specifically want a NF and can afford it, I'd go with the F1 mlr/mil or NPR1/moa setup.
To me, NF's are well-proven and I don't think you can go wrong with any of their products