There are only 3 manufacturers of clay. Somebody who supplies Mothers, somebody who supplies Megs, and somebody who supplies Clay Magic. Of course these people sell to other companies: Zaino clay is the same as Mother's Clay. Meguiars clay--I've never liked. Mother's i've liked but is expensive, and Clay Magic has worked fine for me in the past.

But something tells me you already know this or could figure it out since you're one of the people that has a brain and doesn't make posts on certain detailing websites getting the Zaino people riled up about how their clay is nothing special.