Yes bitcoin is the best investment for the types of crypto currency. And my investment has a lot more funded for holding it.
But still I have some of my investments backing up and supporting my needs with trading.
And if you want to join some legit and trusted ICO's you may try to invest with Betking. Just click my signature.
Gambling is not a reliable source of income and that is not going to be a good way and considered as investment.
Unless you will invest to their bankroll casino's then that can be good way to get some profit with gambling sites.
But playing alone with your bitcoin, that is not going to be the best thing to do and treat it as your personal investment.
You can tell me the best bankroll at this time. No one will be promising at this time.