I don't what you guys are doing, but if I'm just laying on my bed or sitting down at my desk the 3D doesn't move around enough to become blurry. I've even used in the car and it was fine.

I'd say go for the 3DS as you have the option to use the 3D (and it's actually great on the new Zelda), and you can fold it.

Also, the 3DS XL totally sits comfortable in my hands and fits into my back pocket in all my jeans. Are you guys midgets?