I've looked at the other questions on THWACK regarding the Cisco Preferred MIB setting and I realize it depends on the MIB a device supports. I am wondering though what people find works best for them: 1) set the global setting to CISCO-ENTITY-SENSOR-MIB and override it in the node if needed, or 2) set the global setting to CISCO-ENVMON-MIB and then override it in the node if needed.