Cat litter is a personal preference.
That being said, it depends on how many cats you have, what sort of litter you prefer, do you like clumping, non-clumping, clay-based, crystals or pine litter. There are automatic scooping litter boxes and all sorts of litter systems available.
Here we use Tidy Cats unscented. We don’t use lightweight because in our opinion, it is so light that it sticks to feet and the kittens track it all over. We are not fans of the heavily scented litters either, it seems to bother the kittens and affect their breathing. Our kittens are also used to both hooded and open litter boxes.