I did the umbrella technique and tried to visualize which one was more open. I compared the shorter ends of each angle.
Becareful of angle generators. The one in bootcamp is radically different from the one you'd see in Chads. If you refer to the ADA 2007 or 2009 you can tell that a variety of types of angles are used. I would utilize both angle generators to get good at anything they could throw at you.