Based on a brand's targeting, they may want to offer some groups a certain discount, and other groups a different perk like a sneak peek or early access to a new product. If you’re part of both of these groups, you’ll see both stores so you can choose. If we were you, we’d choose the one with the better discount.
Sometimes there may be a special promotion for a new product. One store may have just that product (or product line), while the other store has the products you’d typically see. You’re free to explore each store and decide which one has the goods you’re most interested in.