As a student I used to obsess over university rankings, but I realize now that most of them are massively gamed. My alma mater, the UPMC (Université Pierre et Marie Curie) e.g. merged with other universities in Paris to form the Sorbonne University, mostly to move up in the worldwide ranking. So, it's still largely the same university with the same funding and the same chairs, but since it's bundled up in a larger pa…
Also, if you want the university's reputation to boost your CV, these things change over time. So the "brownie points" of "my university is top of a ranking" may not last very long.
So pick somewhere reputable that will give you a good education and don't obsess about rankings.