I use, what seems to be from the poll, the most popular laptop...Toshiba. I actually have 2 of them. The older one is my main unit and the newer one I have yet to use at a function as I get that infernal 3-prong ground loop hum with that one. Never get the hum at home, only when I am at a venue.
The older Toshiba has been ROCK SOLID for me and I highly recommend them based on my user experience.