Yeah the C Stick, face tracking 3d, built in nfc for Amiibo, faster processing speed that gives you 3x faster when loading a game, and also faster downloading on eShop.

I think Japan one is expensive, compared to US/Asia version.
XL is the Asia/US version, while LL is Japanese version.

Keep in my 3DS has region lock, so you'll have to by the right one.

Oh yeah.. Forgot new XL Japan one cheaper 
Last time I buy rm800 je.. I think now because of our ringgit drop, that's why.

officially supported 32gb, but higher capacity works fine w/o major problem. but if there's something happened to the sd card, they won't help much (it's not like there's official customer support here)
also, higher capacity usually comes in unsupported format, so you need to reformat it manually first (I think it needs to be in fat32? can't remember)

I buy so many digital games on eshop. 16gb also not full yet lol

3DS games are region locked. You might be able to get games from eShop (not sure if local CC works), but the games for AU/ EU region are often delayed compared to US/ Asia.

us & pal are different region

Malaysia got the same region as US. You can get the one from official distro, or import from US if you want special versions. The later one you'll need to get local charger (or a cheap USB charger from Daiso)

What are the chances of getting a TN panel if I plan to buy a white 3DS XL asia set now?