Is SAP FICO a better module than the rest ? why ?

SAP FICO is a SAP Module that consolidates the data from the other modules like FI, MM, SD and so on.

It is also used for internal purpose so the managers to take decisions.

SAP has many modules Such as : ( FI ) finance , ( CO ) controlling , ( MM ) material Managment , ( SD ) sales and distribution , ( PP ) Production Planning , ( QM ) Quality Managment , ( PS ) Project System ,   ( CS ) Customer Services , ( HCM ) human resources 

so it depends on your specialty which module you are going to use