i use a super old 3ds in black, though i have an extra battery added so its super chunky, but the added weight feels nice in my hands i might ask for a new 3ds for my birthday next month though im not sure!
I currently use a red 2ds to play on. I still have my old blue 3ds XL, but the hinge is...broken. It's still playable, it's just not good to bring around.
I play on the orginal 3DS XL (the pink and white one). I have a Sailor Moon sticker on it that I got Ebay but it's pretty beat up. I like the bigger screen on the 3DS XL but it's kind of heavy? I don't if I have weak wrists or what lol but I get tired of playing after like an hour.
I have the old Animal Crossing New Leaf 3ds xl that came with the game preinstalled. I would like to get another and another copy of the game cause I know there are things you can only get by going to other towns but I right now it's too much money. But I am keeping my eyes open for a good deal.