In addition ot Abda's answer you should also check the difference between the Community and the Enterprise editions

The main differences are :-  
     ->While Odoo v9 is already rich with features and functionalities, Odoo 10 has been further developed to make it easier to setup and use.        

     ->Odoo v10 offers an option of showing up multi images along with magnifier. You can now showcase your product from different angles which will help your ecommerce in trust building. The more closely a customer can judge the product, the more chances of him buying it.
     ->New payment options have been introduced including Stripe and PayUMoney. Also, now the customers can save their card details for easy checkout on their next purchase. The placing of an order and invoice validation is a fully automated process in Odoo 10.
-> For more checkout :- https://www.biztechcs.com/blog/migrate-odoo-v9-to-v10/