Hello Burkis, I am curious to know the reason of declining your MPH offers for the DPhil program? They are very different programmes in both subject matters and credential.
I myself declined an MPH for an MSc in Health Policy, Planning and Financing at the LSE and LSHTM, the reason is mainly driven by my interests in both the political arena (specifically policy and healthcare spending) and public health; therefore, the program I chose does a great job of embedding both concepts given that one selects his/her courses appropriately.