-snip-
At first i also did not notice the difference and thought both to be as single site but later i realized that i was wrong.
Both Bitcoincasino.com and Bitcoincasino.io are different casino but the name matches too much that many people who do not look closely the name difference may land on the different site mistakenly.
Maybe you can create an account in both of them. And you can try what the luckiest platform for you.
You will know who's the better and more comfortable after trying both of it, right?