The AoA disagree that WestJet has is the most important feature to alert of an issue. The AoA value display that WestJet doesn’t have may be a safety addition or also a distractor. This is due to the fact that maximum AoA is dependent on many factors that are impossible to memorize by any pilot, so it’s best use is by computerized systems, you don’t want a pilot trying to determine what the max AoA value should be in a high stress situation and not dealing with flying the aircraft - if the AoA displays disagree all they need to do is ignore any AoA value, as the displayed values should be assumed to be wrong anyway.

Maximum AoA varies from about 14 degrees with full flaps, no bank angle and landing or approach speeds to just a couple of degrees at Mach 0.80 while turning at cruising altitude. Air humidity, icing conditions, aircraft weight, engine power setting, bank angle, flap and slat settings and other factors will all have an effect on maximum allowable AoA at any given point in time.