Without a doubt Dell has much better customer focus for technical people. The 4 year support contact w/ accidentally costs the same as 4 years of apple care, but Dell's covers everything except lost and wore down batteries.
Apple requires that you book an appointment at one of their stores, go there, wait on line anyway because there are people who don't want to book online, have someone who can't fix hardware problems look at it, and then say they'll take it but you must give them your file vault password first.
Dell on the other hand after ten minutes of hardware troubleshooting on the phone comes on site with replacement parts. If they can't fix it they send it back for you, and you can request that they give you the hard drive in the machine before they send it. It's very excellent.