If you want to test out an idea for a mobile-focused ecommerce store (or an Amazon affiliate store), cannot code yourself but want to customize the positions of photos, layouts and texts, which tool would you use to build an MVP site - Wix, Shopify(ie using PageFly), Wordpress(using a builder), or something else?
I would use WordPress with a page builder like visual composer and you will need some css adjustments for special layout adjustments that page builders cannot do. Firebug on firefox browsers would be the tool to use with css.