The "Buddy" plan offers you the flexibility to become both a supplier and a retailer. As a supplier, you can enable other stores to sell your products on their online stores. On the other hand, as a retailer, you can sell products from other stores on your online store.
With the "Retailer" plan, you take on the role of a retailer and act as an affiliate for the brands from which you import products to sell on your online store.