The size of the screen dictates the size of the laptop itself, and thus weight. You can’t, for example, get a 17-inch gaming laptop that’s four pounds (although MSI’s excellent GS75 gets awfully damned close at five), so think long and hard about whether you’re willing to take the weight penalty in exchange for the screen real estate. If the laptop is going to be your only gaming machine, having a 17-inch screen might be ideal. We should also add that a 17.3-inch screen is easier on weaker eyes than a 15.5-inch screen. This is very much a matter of personal preference.