Add both classes to your Desired Courses list. Before you generate your schedules:
- Uncheck one of the courses in the Courses section on the mySchedule Builder main page.
- Generate the schedules and choose one that you like.
- Save it as a Favorite.
- Go back to the Courses section and uncheck the first class.
- Check the second class and generate another set of schedules.
- Compare the resulting schedules with the saved Favorite schedule to see which one you like the best.