Many sellers make the mistake of putting Amazon and eBay in the same e-commerce basket. They fail to realize that the differences between Amazon and eBay are profound. Amazon is a retailer, while eBay is basically a wholesaler. A retailer exists to sell products to a wide customer base at a reasonable price. A wholesaler sells merchandise at the lowest price possible, usually to retailers who will resell the goods to consumers.
In practical terms, this means you can charge a higher price and make higher profits on Amazon (but be aware that Amazon does take a hefty cut out of the sale price). It also means that Amazon can be a great place to sell wholesale items purchased through resellers.
Amazon’s business model gives you much less control than eBay. eBay lets you choose between a fixed price and an auction format. Amazon only allows sellers the option of a fixed price format. eBay lets you create your own product descriptions, whereas Amazon creates the product descriptions for you. In practical terms, this means you will do less work on Amazon, but the drawback is you will have less control over your marketing.