Prioritize location (ports and highways), facility capabilities (racking, climate control, handling), technology stack (WMS/TMS/API connectivity), SLA and KPI transparency, labor availability, and pricing structure. Validate throughput, peak capacity handling, and integration testing for order routing and inventory synchronization.

Proximity to intermodal hubs and a dense carrier network lowers transit times and reduces LTL and parcel rates through shorter routes and more competitive tendering. Strong connectivity also reduces buffer inventory and enables more frequent replenishment, improving cost-to-serve for B2B and eCommerce SKUs.

Require real-time inventory APIs, order management integration, ASN and EDI support, exception handling workflows, and configurable KPIs with automated reporting. Ensure the 3PL can provide pick/pack accuracy rates, dock-to-door lead times, and monthly SLA scorecards.

Compare total landed costs per SKU including receiving, storage, pick/pack, returns handling, and outbound freight. Request sample-rate cards and a modeled monthly invoice for projected volumes, seasonality, and peak surcharges. Factor in minimums, chargeback policies, and inventory carrying costs to get an apples-to-apples comparison.