How can I know which mathematical field each country or university is the best in these days? For example, I've already heard that in my country there isn't so much research in algebra and my university is great in geometry.
I wanna know this because I have family in Germany and France (Paris and Toulose) and I have to choose my field of interest in this semester, I like so many things in mathematics and this information would help me to pick one.
Thanks in advance.