Shopify
Product markup is handled well by most themes. The recurring problems are duplicate URLs from filters and variants, and thin collection pages.
Ecommerce Platforms
Store platforms, where template control ranges from complete to almost none, and where duplicate URLs from filters and variants are the recurring discovery problem.
Listings (3)
BigCommerce
Similar shape to Shopify with more template freedom, and the same faceted-URL discovery problem.
WooCommerce
Inherits every WordPress strength and weakness, plus product-specific duplicate URL behavior from attributes and variations.