Which type of Gann angle to use ?

Usually with Gann angles they are based on trading days but the course I studied (David Bowden's) said you should also look at calendar days (which leave spaces for weekends and holidays).The result is quite different as on the trading days version we are still above the important 1x1 from the March low,on the calendar version this angle has been broken.If we reverse soon there will be a 3rd lower high.This setup produced a sharp decline on the Russell chart.