It is kind of hard to say other than for marketing purposes, the new Syntec is SN and has a slightly different add pack. I used it and was very impressed, in fact I was so impressed I will probably be switching over to it "full time" in my Altima. It seems to have run the smoothest in it. I have used many oils in it too...PP,PU,M1 AFE,M1EP,M1(dexos), G-Oil, Amsoil 5w30ASL, QSUD, PYB, SynPower. Trust me I gave all a good chance, the blend I have in now was the last thing I wanted to try besides the new Edge FST.
Great oil, Hope this helps, I am not brand loyal and only my Altima seems to care what oil is in the engine.