Back before I thought I knew better, I selected oils based entirely upon price and would buy anything that met the appropriate API spec.
Now that I think I know better, there are certain oils I prefer, but given the 5-6K drains most of us seem to do, any API SL/SM/SN in a grade appropriate to the ambient temperatures encountered would work just dandy.
You only need worry about oil quality beyond the basic API spec if you have a demanding application or if you want to extend drains.