There are for sure brands that are more perfumed than others, and there are some that are unscented. Of course, the scent is there too mask the pee smell. We use scoop away, which is scented, but not heavily so.
We have a covered litterbox with a little charcoal filter in the lid, and that helps some. Also, since we have dogs who like to look for cat poo roca, we have ours in a closet with the sliding door open just enough for the cat, and that helps too.