In my opinion I think you should have a savings for sure. You need have enough emergency money around for when things get difficult. As far as investments are concerned, gambling shouldn't even be considered an investment. The best investment in my opinion is bitcoin itself.
You are promoting a gambling website while you oppose against it, how ironic. I don't consider gambling as an investment, I consider it a sport. There is a lot of respect for big time gamblers too, money does get you respect too as an extra feature. I think there is never
a best investment, any appropriate asset or field seems to be the most profitable for certain phases, they are never best forever, they are only better.