I think all of these 'sides' are flexible. When I'm talking to a newbie, I tell them what the 'standard' is and why people vary from it. Products are flexible, processes are as well. In addition, your personal experience plays a role.
An additional 'side' would be pressing seams open vs. over. I had problems with 'well used' quilts when I tried pressing seams open, so I don't do that except for small wall quilts. Pressing the seam 'over' clearly makes the seam stronger, especially at stress points. However, it makes no difference for small quilts or tied quilts.
Oh, and binding - bias vs. straight grain.
I'm a definite bias binder, especially once I chomped the bullet and learned how to make continuous bias binding.