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.
That's a good choice. I mean, when you don't have money or don't want to spend your own money, campaign is a good way to do. Once you earn some money, you can use it to trading, gambling and mining. If you want to spend your own money, then do trading, it's good imo.