I got admitted into three different Master programs in my country, and I would really appreciate if you give me some advises. I have been working with a really productive professor since the beginning of the second year of my BS. The project we have been working with is to develop spectroscopy instrumentation, which I think is really entrusting. The second option is to work with data analysis produced on CERN LHCb experiments. I really enjoy programming and I think I would enjoy to work with particle physics. The third option is to work with light scattering on cold atoms, which I have been studying by myself and it is an amazing field, which I am really passionate with. They are completely different fields, and I suppose I could do a good job in any of them. As many physics graduation student, I am really concerned about finding a position after PhD. All being said. Which one I should consider the must?