It is true gambling would be one of the main attraction of Bitcoin .
Crypto currency is the best for gambling sonce it have anonymity gamblers wouldn't worry about their identity while gambling specially for those who doesn't want their friends or family to know that they are gambling.
And for me the best crypto casino right now is
Stake since it have all of the games and it have so many give aways or challenge for us gamblers.
Before gambling coming to bitcoin world, there is many people that already attract to bitcoin privacy because of their anonymous. But with the current situation which gambling casino is coming out so fast then most of them used this as one of the best chance to make their transaction really invisible. And for the best game as I can say, still depends on each players as well and what the casino provides