Neural Decoding vs 3D Reconstruction/Robotics

I'm stuck between the two fields/topic and can't decide which one to put all my eggs in for masters. A little background, I'm first semester master student doing MS AI from a university in S.Korea. Here in Korea you are expected to join a lab from the start of masters and start preparing for research from the first semester. I originally planned to join the computer vision lab but due to unforeseen circumstances and me being a little late, I couldn't get in. So, I had no choice but to join another lab. The main research direction of this lab is emotions and medical ai. But, the the students ar