Not for much longer.
The two you refer were around for 700 years before, still will be long after EU bites the dust. Just as we will trade with Europe long before and after EU, however hard Barnier is determined to make it in the present.
As for top two I would pick them from MIT, imperial or Stanford etc, long before oxcam but maybe I am biassed.
But as I also pointed out the once prestigious ecole de mines in Paris had similar chances to such as Imperial even 30 years ago, But like much of EU it was looking inward not out of EU, and that is the problem with EU attitude that has led to stagnation that thankfully we never embraced. So not my perception then, but a reflection from close association with academia.