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Before I even go into detail, I can tell you now that a Shopify build is a much faster proposition that a Magento build, no question.
Shopify has better design out of the box and requires much less custom coding. In addition, the Liquid programming language is fast for developers to work with. You can have a live Shopify site in literally minutes, and you can’t say the same for Magento.
Magento is a solid platform but does require substantial design restyling, it takes longer to set up and go live, and it’s harder to modify unless you’re a coder, which all costs more at the development build phase.