How does an Oxford PPE compare to other PPE's?

What are the chances of a person becoming an MP if they studied Philosophy, Politics and Economics at these universities;
LSE, UCL, King's, Durham, Warwick, York, Exeter, Manchester and Leeds.
Is the difference between an Oxford PPE and non-Oxford PPE vast?

A terrible question which reveals a complete lack of understanding of how MP candidates are selected, or why Oxford PPE is so common amongst MP's.

Going to one of those unis over another will not increase your odds of becoming an MP by itself. Connections, getting in with the right people in the party/certain constituencies, being in the right place at the right time, ticking the demographic box a particular constituency prefers, being good in a hustings situation etc all matter massively. Having done PPE would put you at a disadvantage arguably in some political parties. The prevalence of Oxford PPE grads is arguably because the individuals who historically do it also tick the boxes I refer to above in certain seats- them having done PPE is not what swings it for them.

Put simply, it's not as simple as "do PPE, become MP". There's so much more to it.

Other than wanting to be an MP, what would be the reasons why someone would want to study Philosophy, Politics and Economics?