Well i have both and if i had the money to get a new one. It would be. Well let me say this first. Friday my fat cat got in my safe and knock my 338 edge over and it fell on the tile floor and my AR15 fell on top of the scope. Saturday i went to the ranch and made a cold bore first shot out to 1250yrds with out doing any thing to the scope or rifle after it fell on the floor and the AR landed on the scope.
So I would buy a Night Force over most scopes out there!!!!!!!!!
I have had both the 8~32 and a 5.5~22 Nightforce NXS on my .338 Lapua. I also bought a new Mark 4 Leupold, but after looking it over I sold it to buy another Nightforce. I don't think you would ever regret it if you buy a 5.5~22 NXS for your 338 Lapua.