I don't know, I never compared. I did get the same laptop (Dell) from Amazon that Dell wanted $59. more and would also charge for tech service. Amazon's was free. So figured Amazon would make it right if I had a beef.
As far as I understand all contracts, it is covered where ever you are at. A contract is a contract unless there is a clause in the contract or an ademun (sp) to the contract. I am not a lawyer but having written contracts for my work place, the coverage is everywhere unless stipulated in contract.