That depends on how much knowledge you have on both or which business gets more of your interest. Trading in stocks and bitcoin are both profitable for long term. The difference between these two is that stock trading is more regulated and legitimate in any part of the world unlike bitcoin that is still being critisize but full of potentential specially in terms of being a medium of payment. If i were you, try to watch a video on youtube and will give you further details which path to take.