I will choose campaign. No money will be required to campaign and there is no risk. I earn good money by bounty. On the other hand, trading and gambling both are risky and capital required.
For me it is best choice to join bounty or signature campaign because for this we will not have to spend our money but we will be able get money, we can earn for free here, it is good to start trading as well but for trading before starting it is good to gain knowledge as much as possible, investing is also a good option in this regard.