If you rotate a Jobo tank the chemistry needed is less. For example in a 1510 tank (one 35mm film) you need 140ml in rotation vs. 250 ml´s for a stand development.
The physiochemical effect of local developer exhaustion is eliminated in rotation so your speed utilisation and contrast compensation is lower in B&W development if you rotate. You gain evenness in developer action and you save.
For B&W everyone has to decide which he or she prefers. In Color the advantages are clear.