Those two classes are very similar but I don't get the differences and why should one be used instead of another ?
Magento\Framework\Api\Search\SearchCriteriaBuilder=> a handful of references in the Magento native code.
Magento\Framework\Api\SearchCriteriaBuilder=> 200+ references
To me, there must be a good reason why the first one has been created but I don't get why.
Anyone can enlight me ?