stake.com is definitely the best in the competition of these three sites.

Sportsbet.io used to be the best site to play, but a lot of unpaid and confiscated money. They turned their main page on bitcointalk  into a page  where steve and bots correspond. Their customer service has become a disaster.

Cloudbet- still has a lot of work to do to regain its reputation. Withdrawals and verification can sometimes wait for a month