Earlier this year migration from Magento to Shopify received a major overhaul so that the process was simpler and more compatible. Already we've began the process of helping a client with that very process. Shopify is continuing to make efforts to help that process extend overto even more platforms including BigCommerce Volusion and Mozu.
Compared to other platforms Shopify offers a much easier tooperate User Interface (UI) along with a very strong 3rd party development community that can extend Shopify's functionality to meet almostany need your online store might have. Their system is extremely fast offerscompetitive hosting plans and has built-in version control for all major files(eliminates most risk when developing unique features for your store).
If you've been waiting for the switch then now is the time to as Shopify is running a huge promotion. From now until December 31 2016 every merchant you move from BigCommerce Volusion or Mozu to Shopify Plus will receive up to six months of subscription fees and data migration free* — a deal worth well over $15000 USD.