So basically, there is weirdness with the manufacturing of 3DS screens. There are 2 kinds of screens you can get with your 3DS, particularly the New 3DS XL. You may get an IPS screen, which are brighter and don't "get fuzzy" when you look at the screen from an angle. Or you may get a TN screen, which are oh-so-slightly dimmer, have less contrast, and "get fuzzy" when you look at it at an angle.
There has been A LOT of speculation about which New 3DS XL models have which screen, whether Special Editions, the Red, the Black, which production run, etc... but no one has found a reliable or consistent pattern. We do know that your a more likely to get the top screen as IPS and bottom screen as TN, rather than both screens being IPS (or "Dual IPS") which is very rare and, if you look on ebay, goes at a premium. And of course, you are MOST LIKELY if you by a New 3DS XL today to get both the top screen and bottom screen as TN ("Dual TN")