This really depends on the amount and type of products you are selling.

From an SEO perspective, Shopify is great for small sites (let's say, under 100 products that don't frequently change).

However, if you have a business with lots of products and that change regularly, it might be a bit riskier. This is because Shopify lacks some of the page indexation/management functionality of some other platforms.

Take a read of these, as I think they will help:

http://www.codeinwp.com/blog/shopify-vs-magento-vs-woocommerce-vs-bigcommerce-vs-wix/
http://tripleseo.com/shopify-seo/
https://ignitevisibility.com/shopify-seo-review/