Its better If you have exp or knowledge on one end to end implementation on any ERP Module.
To get a break on SAP HCM Module or SAP Sucessfactors Below are imp info ..
To do Sucessfactors You need to have Certification on SF, 1 year exp on any ERP Module It would be added advantage if you have knowledge on SF Integration.
To do SAP HCM Module You need to have SAP Certification, MBA Background plus you should have domain experience on HR.
All the best!!!