When the horizon is placed in the centre of the frame we have an entirely different type of image from the one to the left. Centring creates a static feel to an image. There's little dynamic movement or energy in the frame. However, this may be what you want.
Some viewers find this type of symmetry creates a sense of strength, stability and calm. If these are qualities that you want to bring into an image then symmetry may be just the thing.
Then break the rule!