Start with the size you want. Generally, this brand of laptops will have roughly the same types of low-power processors and same amount of RAM and storage, so size will be what matters most. Slim laptops will generally top out at around 15.6”, which is ideal for catching up on a show before you go to bed or playing some games. But a smaller size, such as the 11.6”, will give you more than enough room for the basics, like getting directions and checking email, while being easier to slip into a carry-on and use at the airport. It’ll also weigh less, which if you’re looking to save on bag fees may be a factor.