OpenCart. OpenCart could be a great choice for small businesses without tech savvy employees. OpenCart is very simple to install and start using. It runs very quickly using simple code. OpenCart allows you to set advanced user privileges and separate access for users and groups. A simple code also has drawbacks; often for sale extensions and themes may not be up-to-date with security standards.
BigCommerce is most easily compared to Shopify. Both platforms offer a similar experience when building an ecommerce platform. Like Shopify, BigCommerce offers a range of prices and packages tailored to different types of businesses. The platform is highly customizable if you are comfortable with some light coding. It is also possible to use themes and templates to build your website, but some of these will come at an additional cost.