That's actually quite a complex question as it really depends how you are qualifying "better" and I'm assuming you're talking about reputation.
A PhD viewed from within the academic world will be a mixture of how well the supervisor is viewed, how well the department as a whole is viewed, usually fairly independent of the University itself although not completely. But it's less about specific university.
A PhD viewed from outside, sadly to say, is often viewed by name alone - people will recognise the name of the university, and probably little more (unless they're clued up, which they mostly aren't).
So that's a general answer.