With several companies offering ecommerce services, picking up the right one can be confusing. Quote a few Ecommerce platforms support multiple product types, provide intuitive user interface and offer easy integration with multiple systems but these are not the only factors that make it worthy of purchase.
When you are choosing a platform, make sure it has the following features:

Add-ons and Extensions
In order to handle your growing business needs, you will have to add new features to your Online ecommerce solution. So the platform you choose should allow you to easily add new add-ons and extensions as and when required to enhance functionality of your store. Of course, if you are on a low budget, go for a platform that provides you additional features that are either free or really cheap.
There are quite a few B2B ecommerce software vendors that offer hundreds of extensions and themes, thereby making it simpler to enhance functionality to your site. However, make sure that the extensions you use for developing your site does not destroy your wallet.

Back-end Features
Yes, having a feature-rich storefront is a must to attract customers but even more important is the backend. This is because, you would be devoting a majority of your time at backend to manage your ecommerce platform. So ensure that the backend is easy to understand and operate, which will have a positive impact on your performance. Backend features such as catalog and inventory management, customization options, reporting and analytics etc., help to tackle and overcome any issues while running your ecommerce site.

Good Technical Support/Customer Service

Choose a B2B or B2C ecommerce software provider that offers excellent customer support. For instance, if your site goes down or you face any technical issue at midnight, the customer support should be available and offer prompt service to resolve your issues.  You certainly don’t want customer support that is unreliable and that cannot handle your needs in a timely manner.