First of all, the commission fee of Amazon is high, as AliExpress is now trying to expand the European Market, it canceled the admission fee since the end of 2019. And the process are quite complicated selling on Amazon, much more documents are needed, and it takes 2 weeks for a new store to be process, while only 2 days for AliExpress to handle. Lastly, Amazon is mature platform, which means a fierce competition leading to less margin. It is suitable for taking the boutique route, high unit price products, it is not suitable for sellers without cross-border e-commerce experience to start!