No press source. Students from the same study year gladly stayed on China after some graduate programs. They weren’t Chinese. I don’t think they were the single ones. Who wants to sit in dying Europe? No innovation, no money for innovation. No will for it either.

I am pretty sure, you have zero chance as foreigner to make great career in EU. Though EU is big and diverse. About USA I don’t know. First thing I see is a big problem with visa.