Stick with the Toshiba product, laptops are what they do best! And support is usually available long past the product life, as is with the HP/Compaq support I receive. I have no real life experience with Dell Server support.
My big thing with support is getting support fast. I can have a server part on site for my HP/Compaq product within 4 hours, sometimes less. For HP and Toshiba laptops and desktops, parts usually arrive Next Day.
Dell has done OK with my desktop support, but too many questions regarding support for what I ask for. Working in this field for 25 years, I think I know when I ask for a certain part thats what I need. And for various problems on laptops, sometimes they need to be shipped to Dell. Never had that with HP product.
One last note, I have actually had HP and Toshiba step and cover the warranty on out of warranty equipment, even a busted LCD or 3 or 4. Never had that on a Dell.