There is no simple answer to this question as success is relative and dependent on a number of factors. However, some stores that have been particularly successful on Shopify include GoPro, Kylie Cosmetics, and Rebecca Minkoff.
GoPro is a action camera company that saw rapid growth in recent years. They attribute a large portion of their success to their use of Shopify as their ecommerce platform. Kylie Cosmetics, owned by Kylie Jenner, is another prime example of a store that has seen immense success on Shopify. The company has been able to generate over $1 million in sales in just a few short months. Similarly, Rebecca Minkoff is a high-end fashion and accessories retailer that has also had great success with Shopify.
All of these stores have had success for different reasons, but some of the common factors include a strong focus on marketing and branding, a high-quality product, and a streamlined and easy-to-use shopping experience for customers.