High Quality: WTI is considered a "light-weight sweet" crude oil, and that is simpler to refine, although Brent is actually a blend of crude oils, including each "light-weight sweet" and "significant sour" grades. Screening is by references that POs check with each other for, not by printed reviews or from https://maps.app.goo.gl/VhAGTRCDGTuVhHJa8