I have a red 2DS that I play my second town of Gem Isle on and just recently got a red 3DS XL for my anniversay that is coming up the end this month. I use it to play my town of Cat Cove on.
I play on a Blue XL.
For quality purposes, and my old 3DS's screen is....weird...I can't really describe it, it's like the colors are lighter than usual or something.