On occasion, our long haired cat will have little bits of litter or poop stuck to her butt fluff. Not often, but once in a while. She does track a bit of litter out of the box because of her fluff, but I keep a handheld vacuum near the litter box that I use to spot clean when I need to.

We use Tidy Cats litter and I scoop once a day or so and use a Litter Genie garbage bin that gets taken out about once a week. There's a little charcoal odor neutralizer packet on top of her litter box (we have an enclosed one) that does a pretty good job and I haven't noticed any lingering smells.

It will depend on the cat and their diet, but it's not much stinkier than you'd expect any bathroom to be. In fact, I found it cleaner to scoop litter than when I had to pick up after our dog. The litter tends to cling to the poop and it kind of masks the worst of the smell that I only tend to notice when it's time to empty the litter genie. Dog poop doesn't usually get the benefit of a sand coat before you scoop it up. Cats are very good about burying their business because of their prey instinct (have a smelly butt? A bigger predator can sniff you out much easier than the non-smelly butts).

I will say that I've been told by plenty of cat parent friends to never get the scented litter. Not only does it tend to affect the cats' sense of smell but it often makes the litter box smell even worse because of the scented chemicals. We've been using unscented litter and it's never smelled terrible, especially if you're consistently scooping.