If you want to make it sound like an authentic marketing document, and keep the idea of "mente", I suggest "mind share". This is a similar concept to brand awareness.

"When people think of examples of a product type or category, they usually think of a limited number of brand names. The aim of mind share is to establish a brand as being one of the best kinds of a given product or service, and to even have the brand name become a synonym for the product or service offered".
http://en.wikipedia.org/wiki/Mind_share

The Spanish is extremely wordy, and can be expressed much more concisely in English. For

Con una fuerte notoriedad de marca, la marca se sitúa en las primeras posiciones del conjunto de selección en la mente del cliente y esto representa realmente una auténtica ventaja competitiva y una barrera de posicionamiento a otras marcas

I suggest:

The brand enjoys a high degree of awareness and mind share. This represents a real competitive advantage, and a hurdle to other brands seeking to position themselves in the market."