BigCommerce
CommerceTools
You are a mid-market DTC or hybrid B2B/DTC business outgrowing an all-in-one platform like Shopify Advanced.
You are a large enterprise with a multi-brand, multi-region, or omnichannel strategy that monolithic platforms cannot support.
Key risk: Believing BigCommerce is 'open source'; it is an API-first SaaS platform, which has different implications for customisation, technical debt, and ownership.