Ive owned both.
Had an older 2-12 on a SPRish clone I build 10 years ago. It was a good little optics, Great Glass, fantastic reticle at the time (still love the MP-8), illuminated and a good price at $900 bucks back them. Even came with a free set of TPS rings from Scott @ LO when he was starting up here on the hide.
With that beind said, I would go with the NF. It will be lighter, more reliable, and you will have zero issues tracking. IOR does not have a track record of flawless optics, and if you get a lemon (good chance you will) their CS sucks donkey balls. Good glass does not make up for poor tracking/reliability, which is unacceptable in that price range.
I would also look at the March or the New Steiner 3-15 coming out.