Shopify leads e-commerce platforms in 18 of 21 markets; Magento and Tiendanube take the rest

Three brands lead the e-commerce platforms category across the 21 markets I compared in the 4-week window closed on September 14, 2026, with 1,150 answers from ChatGPT, Gemini and Claude. Shopify sits first in 18 of the 21 markets. Magento takes the top spot in Italy and Germany. Tiendanube leads in Argentina. The pattern is close to uniform, with three markets that break from it.

The shares behind those leads move between markets. Shopify reaches 19.2% in the Spanish-language global set and 13.7% in Mexico. Tiendanube holds 16.9% in Argentina. Italy and Germany, together with Argentina, are the places where a different platform appears ahead of the brand that leads everywhere else. A marketing manager at a platform sitting second in one of the 18 Shopify markets reads this as a map of where the models already name an alternative first. An agency serving a regional platform looks at Argentina as the market where the models put that platform on top, and at Chile, Uruguay, Peru and Colombia as neighbouring Spanish-language markets where Shopify still holds first place. I read the three exceptions as the markets where the answers depart from the global picture.