Nintendo DS
Nintendo DS Lite
Nintendo 3DS
Nintendo 3DSXL
New Nintendo 3DS
New Nintendo 3DSXL
“I picked up a used New Nintendo 3DS”
I don’t actually know anything about the DSi! I’ve had almost every other type of DS, but never a DSi.
According to Wikipedia it seems to be an upgraded version of the DS with a better CPU, speakers and larger screens, but lacking the GBA-cartridge port
It’s basically somewhere exactly between the DS and the 3DS. It has games & apps you can get from the eshop (can’t remember if that’s what it was called), it has cameras, but the games will have about the same graphics fidelity as regular NDS games. It had few games exclusive to the DSi. Alternatively just think of it as an NDS with a home menu and eshop