High Quality: WTI is taken into account a "light-weight sweet" crude oil, which can be easier to refine, whilst Brent is actually a mixture of crude oils, such as both equally "light sweet" and "large sour" grades. Screening is by references that POs check with each other for, not by https://maps.app.goo.gl/VhAGTRCDGTuVhHJa8