Regarding the smell and the additive packages, it makes for great internet chat. But it likely means nil in the real world.
All the major players (Delo, Delvac, Rotella, VPB, Tection Extra, etc) all have slightly different base stock configuration and additive packages. That is the whole point of free market solutions.
But, the output of those products is actually quite similar, if not the same. They all protect against wear, fight contamination, and resist heat to a degree that suffices the OEM criteria, and API, SAE, ILSAC specifications. Different roads to the same destination.