I didn't think I'd say this, but the 3DS XL has a lot more going for it than merely a larger screen. The larger body fits more comfortably in the hand, battery life is a lot better and the build quality feels a lot more solid than the original 3DS.
Larger screen makes portable gaming way more comfortable than on the original 3DS; nice design and build quality
Most 3DS casings and accessories will not fit the 3DS XL