No fulfillment model is automatically best. The useful comparison is conditional: which route fits the actual destination, shipment, operating capacity, and service requirement.
When a postal route may fit
Postal options may suit some lower-urgency, cost-sensitive, or broadly distributed shipments when route coverage, size limits, tracking, and delivery expectations are acceptable.
When international express may fit
Express services may suit time-sensitive shipments that need more detailed tracking or defined handoffs, subject to provider acceptance, dimensional charging, surcharges, and destination coverage.
When an overseas warehouse may fit
Local inventory can shorten the final delivery stage, but requires demand planning, inbound movement, storage, inventory control, returns handling, and local operating arrangements.
Compare the complete operating route
Review transit expectations, total cost inputs, visibility, capacity, exceptions, returns, customs responsibilities, and inventory risk together.
Carrier, warehouse, customs, rate, and availability decisions depend on the real route and transaction.