First of all, check the website name on search engines, and don't forget to add "scam" next to the brand name in order to find related articles/posts. There are many factors to choose the best casino that suits your requirements which can be completely different depending on the user's personal experience. BTW, you can check this thread and read the opinions of other forum members before making your decision:
https://bitcointalk.org/index.php?topic=5382430.0Normally, you will hardly find a casino that avoided those scam accusations on the web. I think that online casinos use those "scam accusation" schemes as a kind of elbowing as the competition is hard in this area. But in fact, you will hardly find a casino scamming people. Some punters lose money, others break rules. Casino's edge allows those sites to stay alive and even to earn money. I always treat those scam accusations with big scepticism, as they have no real ground at all. A casino may scam you in one single case, I think, when you have won a big amount and they don't want to pay you. But this is a rare case. Normally, casino has enough profit to cover its losses that were caused by a lucky gambler.