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Pros
Pro Big screen
Pro Has built-in NFC
This means Amiibo and Amiibo card support for scanning in figures and cards with a tap to then use as addons in certain games. Previous models did not have this function.
Pro Improved glasses-free 3D
The New 3DS XL has an improvement over the regular 3DS XL model when it comes to the 3D, there is now an infrared sensor that allows for eye tracking, which keeps the 3D focused, even when the device moves. The older model had trouble with the 3D focusing when moving the device around, that is now fixed for the most part.
Cons
Con No charger included
In order to keep the price down on the unit Nintendo has chosen to not include a charger with the device, meaning that if you do not have one already or purchase one you will not be able to use the device past the half charge that it has out of the box.