1. The business model: in China, the most popular e-commerce open source program is ECSHOP, the business model is to have free version and business version. Business version will provide technical support, but there is no important different features. They also sell webhosting, and customized development. Western one is taking prestashop (a french one) as example, it provides basic features freely, but charge money for some modules and templates, like filter, payment, logistics, etc., also the basic features have already some of these modules, but if you want to easily code some features or have some advanced features, you can pay for the modules that you like. Modules are provided by prestashop or community, some of them are free, but mostly they charge money.
2. Prestashop is better in modulization.
3. Western e-commerce open source programs including zencart, magento, prestashop, are more friendly in SEO than chinese ones.
