The native resolution is simply the setting at which your screen will render the clearest images. Since games are constantly in motion, slightly soft zor blade 15in laptop edges may not bother most gamers, but keep in mind that while this is your gaming laptop, you will likely also use it for other things like surfing the Internet. If the resolution isn't comfortable, you aren't going to enjoy using it.
As you probably know, a movie theater screen and a TV screen have different proportions. Likewise, there are widescreen format gaming laptops and there are laptops that have a standard aspect ratio -- like that of a TV. A widescreen format gaming laptop (a 16:10 ratio) has advantages and disadvantages. Many games today do not have a widescreen mode. This means that the game may stretch across the screen and become distorted or you may run it with black bars that fill in the sides. There are ways to get around this, but if you want an out of the box perfect experience, the widescreen format may not be for you.