I've got a 3DS and 3DS XL, I haven't used a 2DS yet, but I'd recommend the 3DS XL based on my experience with the others.
It's nice to have the 3D option for the games that use it well, even if you don't plan on using the feature often.
The 'sweet spot' of the 3D effect is really good for the XL.
It looks better, and the clamshell design feels infinitely safer when cased.
Plus there are plenty of special edition (like the nippled Pikachu edition) of the XL's.
I also recommend getting Kid Icarus Uprising for the 3DS stand that it comes with; it's perfect for stylus-intensive games.















