From personal experience, I'd say Toshiba. I've had 2 Toshibas. My wife always buys HP's and everyone at work uses Dell. I never have any of the performance problems my wife or coworkers have. Both the Dells and HPs I've seen really start to lag in performance with age and I haven't seen any of that with my Toshiba. I use a larger Satellite (17") and it does put out some heat. I have never owned any of the smaller (<15") models so I can't speak for those.