Hi Keeli! It's funny, I was thinking of starting a similar thread! I also have two older kittens, so they use their boxes often enough for me to consider about their litter.
I've used only two types of scoopable clay, one being PetCo's brand (unscented), and the other Dr. Elsey's ultra precious (blue bag). Dr. Elsey's was much less dusty, especially when pouring new litter out from the bag. One of my cat sneezes every once in a while, so I think I may repurchase this again. I also don't like inhaling dust particles myself when scooping/pouring litter. Watch this link:
I've also heard of a brand called "Integrity" which I've yet to try. They make several types, such as the traditional, scoopable clay and natural, biodegradable types. If I try it out and deems worthy, I'll let you know.
I also recently got a better scoop, called the "Litter Lifter". It really helps because the way the tines on the scoop are designed...no shaking/sifting, means less dustiness for me, and the process is much quicker! Link to watch: