The main difference between Google SEO and Amazon SEO is its algorithm.
Google wants to deliver the most relevant results to a searcher's query. Its algorithm is updated often and is focused, for instance, on website content, online reputation, webpage authority, page quality, and mobile-friendliness.
However, Amazon's algorithm is understanding shoppers' needs and displaying the products that are most likely to be purchased by searchers.
So, if you are planning to sell products, I would recommend you go for Amazon SEO.