It is difficult to say what is better. In my opinion, both of them are worth to do. Of course, it also depends on your knowledge and your skills. If you have good at a trading skill, you can get more money with short-term trading, if not you can lose everything you have. If you do bounty campaigns, you no need to invest your money but it takes you time and sometimes you can get nothing or waste, but if you find the right project, you also can get much profit. I suggest you should do both of them, trading and also do bounty. And you can split your capital for short-time trading and long-term investment to reduce risk.