Thesis machine learning

I have to choose my thesis for my masters degree in "Computer Engineering Science ".

I'm interested in having a thesis on the Machine Learning subject.

The two topics I'm interested in are these:

• Identification of new cancer genes for neuroblastoma research (classification, semi-supervised learning)

• An automated investment strategy using advanced machine learning (comparison of different ML approaches)

These are only two topics in a whole bunch, but my problem is that I can't decide which one to pick.

I thought maybe Reddit could help me?