My rule about borders is that you don't want any two fabrics to be the same width. That isn't proportionally pleasing to your eye. So, when I want a 3-fabric border, I often will choose 1", 2 1/2", 4"..... or 1/2", 1 1/2", 3"..... something like that.
And the picture you posted on the left would be more desirable to me.