Sony, Acer, Dell,Toshiba, and HP are best companies of Laptop manufacturing. You should buy the laptop of a company who provides good maintenance services too in your niche, so that it could be easy for you to get its spare parts or services done if you feel any abnormal condition to its services. Mainly battery back up problems are come to face with laptops.
Secondly proper care is most important for a laptop of any brand to take its services for a long time. Generally people sell it after using two or three years, as new technologies and processors are replacing the old models.