In general, fermented products have more bioavailable products, due to pre-digestion by bacteria. How much this actually matters, I'm personally skeptical of,

In general, fermented products have more bioavailable products, due to pre-digestion by bacteria. How much this actually matters, I'm personally skeptical of, but it's a boon touted loudly and widely by all fans of fermented products who feel their food choices need to be justified by more than "it tastes good."