The 3ds is better because it does everything the dsi does but it is 3d and it could have more stuff.
No, the 3DS XL is slightly smaller than the DSi XL
No, the Nintendo 3DS XL is slightly smaller than the DSi XL
yes, but better
a 3ds is a dsi with 3D effect. a dsi XL is a big dsi. you can choose: 3D effect or being big. i would choose the 3D effect.
There are several types of Nintendo DS systems ranging from the Nintendo DS, Nintendo DS Lite, Nintendo DSi, and Nintendo DSi XL. The newest version of the Nintendo DS is the Nintendo 3DS and Nintendo 3DS XL.
Yes, the Nintendo 3DS (as well as the 3DS XL and 2dS) has its own 3DS games that will not work for the Nintendo DS, Nintendo DS Lite, Nintendo DSi, and Nintendo DSi XL.
it will be lower than it is now
You can't trade JUST you DSi system in for a 3DS system anywhere.
A faster processor and more RAM was added to the DSi. This will allow for better looking and smoother gameplay.
The Nintendo DSI, DSI XL, 3DS, 3DS XL, New 3DS, New 3DS XL, and 2DS all take pictures
it depends, if you want to play DS/DSi games on your 3DS than R4i 3DS is your only choice but if you want to play DS/DSi games on your DSi then the R4i Gold. Both of them are vrey popular in Nintendo players. It is hard to say which is better, just as you like.
It will fit, but it will not work on the Nintendo 3DS