Neither! If you have one, buy it with your VISA card and you automatically get one free year of VISA coverage that covers the same things as the original hardware warranty. After that you can extend it for three more years for a fee that is less than $200. It comes with a no-lemon policy (three repairs and if something goes wrong after that, they replace the machine with a new one), battery replacement, and the freedom to choose any repair place you want, including Apple. I just had my mother's powerbook repaired and got the reimbursement within a week. Superb service and I've used it a lot. Never even a hint of hassle.
Check with your credit card issuer to see if you have it as not all cards do. It's called VISA performance guarantee.
Good luck!
Oh, and they will pay even if you need to have something fixed while you travel abroad - I asked.