High-quality: WTI Is taken into account a "gentle sweet" crude oil, that's simpler to refine, although Brent can be a blend of crude oils, such as both "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