POLIS MPhil at Cambridge or Public Policy at UCL/LSE?

I'll be applying for a master's in a couple of years after graduating from york in politics with international relations. The current trajectory I'm on in terms of grades/internships/UG publications etc. is likely to make me a pretty competitive applicant by the time I apply, and I think that these universities are well within my grasp. In the future, I hope to work in research in think tanks/ngos. I've always wanted to study at Cambridge so there's a personal fulfilment factor there, but I worry that the POLIS MPhil wouldn't be as employable/well suited to my career goals as a public policy degree. Some of the requirements for mid-senior level positions at think tanks ask for a public policy degree and I'm concerned that POLIS is too generalist and might not give me as much of a leg up in this world as public policy might. Also, I'm aware that Cambridge offers a public policy course, but you need around 5 years of work experience to even be considered, and it's far more competitive than the POLIS MPhil.

I'd appreciate any advice, thank you very much.