TCO comparison at $50M GMV, which actually wins?

A reliable total-cost estimate needs current supplier terms and an equivalent solution design. Price the same company purchasing rules, stores, environments, support and integrations. Separate the commerce contract from apps, payment costs, implementation, migration and ongoing maintenance. On the Adobe side, specify SaaS, PaaS or on-premises; on the Shopify side, confirm the Plus agreement. Use the sales figure in the question as one input to the quote, rather than a formula that decides the winner.

Official references: Shopify current pricing; Adobe commercial pricing; Adobe deployment models.