These were all made at the same time and dried in the same way. Left: Three out of five have cracked on the bottoms. Right: None have. Guess which is the porcelain? Of course, I could have been more careful and dried the porcelain ones more slowly. That is the trade-off, more care (and expense) to get a whiter more vitreous result. So, for production, it makes sense to use a stoneware if at all possible.
Clay Cracking During Drying
The best way to avoid drying cracks when making ceramics or pottery is to avoid doing the things that cause it. Do not just blame the clay, anything can technically be dried.
To potters, stonewares are simply high temperature, non-white bodies fired to sufficient density to make functional ware that is strong and durable.
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