Difference between relative Db table and EAV table
ALL Magento Models inherit from the Mage_Core_Model_Abstract class.
Difference starts from the Resource object.
All resources extend the base Mage_Core_Model_Resource_Abstract class but
simple Models have a resource that inherits from Mage_Core_Model_Mysql4_Abstract (Mage_Core_Model_Resource_Db_Abstract),
and EAV Models have a resource that inherits from Mage_Eav_Model_Entity_Abstract