However, mathematical statistics requires knowledge of advanced mathematics, and the way of thinking is different from that of advanced mathematics. If you are still used to the way of thinking in advanced mathematics, it will be easier to do mathematical statistics.

From the examination point of view, the difficulty of mathematical statistics is slightly lower, but the score is often worse than the high number, because many people are not used to starting from what angle. And generally speaking, people spend less time on the course of mathematical statistics than advanced mathematics, so it gives the impression that it is difficult for mathematical statistics to attend advanced mathematics.

So the overall impression is that mathematical statistics is more difficult.