Master Data Governance Two client Approach

Hello Experts,

I have a Scenario for MDG 2 client Approach,

Scenario 1. Currently Client are using MDG 7.0 version of Oracle Data base.

Scenario 2 : Now my client would upgrade with MDG 8.0 with S/4HANA of Central finance(Simple Finance).

now my question is....

1. If use the same client approach (Existing MDG 7.0) for upgrade from Oracle DB to S/4HANA with MDG 8.0, then what is the Pros and Cons.

2. If Client will go with New Client Approach (MDG 8.0 - S/4HANA), then we will review the Landscape design of AS-IS and TO-BE. Then what is the pros and Cons.

Please provide the best practice on Landscape design as well as..

Thanks in advance.

Regards,

A.Madhu Kumar