After much back and forth I have now gained me a 3DS, but the question of the model was not that easy as they had hoped. I had neither the normal nor the 3DS XL version in the hands and was quite skeptical about whether minimally enlarged screens and a few other gimmicks were really worth their money.
After I had borrowed the normal 3DS my cousin for two months, however, I must say that my XL variant definitely prefer. She looks much better visually and "noble" of; that the menu items (Home etc) now right buttons are was really a relief, the processing is to be incorporated qualitative than its predecessor, and for that I pay to spend a few more Euros.