http://DaDice.com is one of the best site that you can play at the moment. It has been giving out more bounty and giveaway. But don't gamble more than you can afford to lose. Gambling is just for a bit fun and not abuse it.
I'm positive most of the people gamble hoping to win, while accepting the odds are against them and they,most likely, will loose. The problem is that gambling create addiction and most people start confusing fun with addiction at some point.
So, to simply answer the op's question: "What is the best bitcoin casino?" - IT'S THE ONE YOU OWN. Any other casino or other type of gambling website is much more likely to end up owning your
BTC, than you are owning their
BTC.
+1.
BTC casino that allow you to invest in their bankroll are probably a good option to put some of our coins. While BikiniDice is not allowing users'
BTC investments in their bankroll, is still possible to invest in the supported altcoin bankrolls (Dogecoin, Litecoin, Darkcoin, Blackcoin, Tittiecoin). If you don't like to convert some of your
BTC in the said altocoins to invest there, You may want to look at
DaDice - thread,
here - or at some of the sites listed in
Bitcoin Dice Guide comparative listing of dice investments (thread,
here). As a final notice:
Always do your own due diligence and
Only invest what you can afford to lose!