the basic type (comes together with the ndsl) is more than enough:

comfortable to my hand, sizing is just right.

most stylish as mine is in red, quite unique and fit the whole red ndsl nicely.

cutest - emm! not really but it fit into the slot nicely, so doesnt matter as some with Mario head does looks cute but have to be kept separately.

must have: at least the most basic one that come with the NDSL. the rest is just accessories.