You should do both, since one can cover the other, if you invest into your own project it may take time till you get some decent profit, something you can achieve with trading, soo you can do both and well the big difference is into an investment if no one uses your product service you will had lost money trying it, while trading you can control your loss.
If you're going to use the money you've made from trading to cover up your losses in investing, then why not just do trading alone instead of doing both? This way, you can focus on trading better and maybe make more profit. By covering the losses of the other one, then you might as well be wasting your time. Don't dive in trying to do two incomes at once. Dive in by just focusing in one and then once that's stable and you feel like you've grown to it, then go ahead do the other one. What I'm saying is that you should try trading first. If it's good, then carry on. Do it, and be good at it. Eventually try investing once the earning from trading has been good for a while. But if trading is bad for you, then try investing instead. Don't do both of them at once at first.
