Fiori Deployment Option for Central Finance

We have SAP ECC system with Hub Deployment for Fiori (Separate Gateway system for the Front End).  We are planning to implement Central Finance (Deployment option for S4HANA) with Source as SAP ECC system.  What’s the recommended deployment option for Fiori.

a. Embedded Deployment for S4HANA or

b. Use Hub Deployment (Use Existing Gateway server) and connect S4HANA (CFin) system as a Backend?

Thanks & Regards