Multi-storefront on each — feasibility?

Magento multi-store is the gold standard: one admin, multiple stores, multiple websites, multiple store views, shared customers / catalog / inventory or independent — you choose. Three brands sharing 80% of catalog with separate themes / domains / currencies / tax rules — native.

BigCommerce Multi-Storefront (released 2022) is real and improving but constrained:

• Available on Pro + Enterprise plans only
• Each storefront shares the catalog; per-storefront pricing / inventory rules are limited
• Customer accounts can be shared or per-storefront, configurable
• Separate themes per storefront, separate checkout

For 2–3 closely-related brands sharing most catalog: BC Multi-Storefront is fine and easier than Magento (no DevOps multiplier).

For 5+ stores, deeply-different catalog rules per store, B2B + D2C splits, country-specific tax / pricing logic: Magento bends, BC starts working against you.