What should be more important for the management, sales or voice of the customer?

Voice of Customer

sure the voice of customer, with this sales are guaranteed

العملاء وصوتهم اهم من المبيعات بحد ذاتها لانه اذا ما حدثت خلخله في صوت العملاء ستؤدي الى زعزعة المبيعات وتراجعها

Sales today is not about pushing the product to the customer, but identifying the customers'  needs and pitching your product to address this need. Hence, continuously listening to the voice of customers is essential to understand their needs, and in planning marketing strategies to drive sales.

If you are not listening or addressing a need/ problem by providing a solution, even the best product that a company develops won't sell! So I guess the answer would be to listen, interact and address through product development before sales.

I THINK BOTH OF THEM YOU HAVE TO MANAGE  AND CONTROL IT

just fyi, voice of your customer can go negative as well ;)

Both! You listen to your customers to increase sales, and you need to increase sales to have customers to listen to.

Both,management has to see both .