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Get whatever works around your budget. If it's for X and Y, then you're just as fine with a 2DS as you are a 3DS XL. However, keep in mind that the 2DS does not fold, and the 3DS XL does. But also, the 3DS XL costs more than the 2DS as well.
Get the 2DS. I know you're not me, but I don't actually use the 3D and actually never really have for any extended period of time (ie more than 5-10 minutes).