How to predict which of the two stacks of cards on the table will be selected by the audience

Put two stacks of cards on the table, one of which has 7 cards, and the other has 4 cards. Of course, a corresponding deck must be prepared for this. Then tell the audience that you can predict in advance which of the piles the audience will choose, and say that it will be a seven-pile stack. Such words can be attributed to any pile, since in one case this can refer to the number of cards in the pile, and in the other to the value of the cards. In the end, whatever the pile of viewers did not choose, you still correctly predicted.