Without mentioning any specific competitors, I can say that Crypto-Games holds up very nicely compared to other Monero accepting sites that I know.

They've got a very low house-edge for dice, only 0.8%, which already puts Crypto-Games ahead of most other cryptocurrency gambling websites.
On top of that, you can instantly withdraw your winnings whenever you'd like, no need to wait hours or days before you get your coins in your wallet. (Also, you can choose network fees yourself)

Then add the fact that Crypto-Games is very trusted in the community and they respond extremely fast to any support requests.