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Going with a system that has worse visual resolution and less vibrant colors, in my experience, than its predecessor just because you want people to see you playing a handheld in public from farther away. This is what I hear the most form people "upgrading" the a XL at my shop..
About the only time I recommend an XL over an Original 3DS is if the person has very large hands (most males), if they have poor eyesight, or are never going to play it outside of the house, save for travel.
TBH, most of the time I'm just thinking, "How are those sausage fingers treating you?"