Prioritize WMS/API integration, pick-and-pack accuracy, order throughput consistency, SLA definitions (OTIF, lead time), returns processing, kitting and value-added services, and flexibility for seasonal volume shifts. Require sample KPIs and a data access plan to validate performance.

Closer proximity to highways, intermodal terminals, and parcel hubs reduces last-mile mileage, zone charges, and LTL lane complexity, improving delivery windows and lowering per-shipment costs. Evaluate average transit times to your key customer clusters, not just mileage.

Compare base storage, pick/pack rates, receiving and putaway fees, dimensional weight billing, minimum activity fees, chargebacks, return processing costs, special handling, and integration/onboarding charges. Ask for modeled quotes using your SKU profile and seasonal peaks.

Conduct site visits, review operational KPIs (pick accuracy, dock-to-stock, OTIF), request client references in similar verticals, run a pilot or trial period, and require real-time reporting access. Include clear remediation clauses and performance-based incentives in the SLA.