It is not a question of who is superior.Then why did you imply that the op was only a question rather than a declaration?
Which has nothing to do with which is superior. Christ and His salvation is superior. There is no room for question on this.
The testimony (scripture) cannot be greater than that of which it testifies about.
Scripture is Gods own testimony of who He is. It cannot be greater than Him and that is what you are suggesting here.
It is what is the greatest gift given by God to mankind?
Without scripture you do not know of the trinity, the fall,sin and death, the law and gospel,regeneration,justification, new birth,election, predestination, the
Covenants of promise...you know nothing with Divine authority