I just get a new 3DS console ,and want to buy a flash cards like the old R4DS to save some money.

and goolged, there are some flash cards, such as Gateway 3DS, R4i Gold 3DS and 3DSLink.

Gateway 3DS is about half expensive than R4i Gold 3DS and 3DSLink,
is it really much better?
You can check the price at BestR4i3DS.com
wish some one can explain.