A large 17 or 18-inch laptop is deal if you mainly use your laptop in 1 place, like at your desk. Due to the large size and the heavy weight, they're less suitable to take with you in a backpack or laptop bag. The benefit on the large screen is that you see a lot of details and mistakes stand out sooner. That's why 17 and 18-inch laptops are mainly suitable for tasks like gaming and intensive photo and video editing.