Nightforce NXS 3.5-15X50mm C429 vs Leupold Mark 4 ER/T 6.5-20x50 H58 110562

So I'm looking for glass for my Mk12 Mod 1 build. I'm not ready to pony up for the purist "Clone Correct" optics but these are close enough for me. I'm going for a late GWOT build. Anyway, I have the opportunity to pickup the Leuy for $1100 and the NF for around $1350-1400. I've never owned glass from either company (I'm a Vortex Razor Gen II guy). The FFP of the Leuy is a big plus but not a requirement. I'm a fan of glass clarity, good turrets, accurate tracking and customer service, etc.. This will most likely be a range toy, no hunting or anything. I know these optics are long in the tooth these days, but what would you pick and why?