SAP MDG co-deployed with SAP ERP in different client

Hi Experts,

I have a requirement where my client wants to co-deploy MDG with new ECC system.

The ECC development for is happening for multiple SAP modules and the MDG development will begin simultaneously.

Question : is it a good option to have separate client for the MDG development?

                  Or should the MDG development be done in the same client as the other module?

Please help me with pros and cons of it.

Thanks & regards

Ashwini