The tariff tax will be the same for all carriers, but the actual rates the carriers charge for their services will be different. EMS shipping through the post office is usually much cheaper than DHL, FedEx, and UPS. Even the processing fees are different by carrier. For example, DHL charges an additional $17 duty processing fee on top of the tariff and actually shipping cost on items while FedEx only charges $9.75 + tariff + shipping for items valued under $200. To further complicated things, you get discounts if you have an account with specific carriers.