Feedback from experience for 3 to 5 years
Cloudbet: Never had any deposit / withdrawal problem. Fairly high maximum bet in sports betting as in live casino. For me it is the best, the most fluid, the best live casino, and the largest volume of games.
Sportsbet io: The same as cloudbet but with a less efficient interface.
Fortunejack: they blocked my maximum bets at 0.05 btc from the moment I started to win big amounts. As long as I lost I could bet a lot: o)
1xbit: No worries of deposits / withdrawal but the site is slow and the interface is rotten
Betcoin ag: Sports betting correct no worries to report my live casinos light years away from Cloudbet.
Nitrogen: Only sports betting but personally limited because not many betting options on European football. No worries to report on deposits / withdrawals
Wink org: No worries to report but the limits are still quite low. Very clean interface.
My conclusion is that Cloudbet seems to me the strongest site with probably the most number of users. I think they generate a lot of money and are less likely to rip off winning players as they must have a large stock of bitcoin / funds.
PS: I used google translation.