+1 Hatter... even though SN+ has pushed oils closer and closer together with less room for "wildcatting" an oil's makeup, I'd still take an oil known to have more AW and antioxidants over one with a slightly lower NOACK.
And ChrisD46, how about this: while it's not 100% bulletproof, lower NOACK generally seems to follow oils with LOWER viscosity index for a given oil grade. Which means that oils like ENEOS 0W20 Sustina, a darling of some here, has a higher relative NOACK with its 227VI vs. say some of the oils with VIs in the 170s, even if it is only 1-2% difference. It's all a balancing act when changing things in an oil, there is no free lunch. Since keeping metal parts apart is the primary concern when looking to prevent wear, NOACK is not going to help save your engine if the oil won't keep asperities from grinding each other into a fine metal slurry. Just my 2 cents.