Mainland UPS ships direct from Mainland (e.g., SZ/GZ): faster first scan (≈24h), higher rates, generally more stable; HK UPS requires a Mainland→HK transfer before uplift, so it’s slower but cheaper, with richer flight options yet more peak-season backlogs.
Scope: HK channels accept more “sensitive” goods (e.g., batteries/power banks), while Mainland channels generally don’t.