Man, these things used to turn into flame wars back in the bad ole days (usenet in the early 1990's). Those of us who went through them a time or two started to realize what was important, and that was:

That you HAVE oil. This is 90% of the battle.
That you have the right Level of oil, and we're approaching 95%
That it gets changed, occasionally. And that brings us to 99%

That last 1% is personal and doesn't Really mean anything. But it's where all the arguing and opinions stem from. Personally, I can't do store brand... logically, I know it's coming from the same bulk distributor as the specialty and smaller name brands, but I just can't do it. So I buy a name I recognize, and then usually just shop by price. Hundreds of motorcycles and a half dozen cars since 1990, covering ~1.4million miles plus 2 decades of experience as a profession motorcycle mechanic and I've yet to see damage due to oil brand.