Rule or Suggestion?

Which is actually better, a Rule or a Suggestion?

A Rule is –

a prescribed guide for conduct or action;
an order or direction;
a regulating principle;
a usually valid generalization;
a standard of judgment.

To Suggest is -

Suggest stresses putting into the mind by association of ideas,
awakening of a desire, or initiating a train of thought

to seek to influence;
to mention or imply as a possibility;
to propose as desirable or fitting;
to offer for consideration;
to serve as a motive or inspiration for.

A Suggestion is –

The process by which a physical or mental state
is influenced by a thought or idea.

The process by which one thought leads to another
especially through association of ideas.