Hello Rahman11, it's because of doubts like that, that I've created a thread where users can rank sportsbooks. This way new users can see other's opinions and make a good choice. BetAdviser did the same about casinos, so you now have access to threads for bookies and casinos. Only dice is missing right now, but there are several other threads with monthly ratings etc. I suggest you look to all of them, and I'm sure you will find a good place to gamble.

Finally, if you ever try bookies, please take your time to rank them, so the helps continues!
Here are two fo the threads I've talked about:

https://bitcointalk.org/index.php?topic=1820529.0 (Sportsbook)
https://bitcointalk.org/index.php?topic=2042070.0 (Casino)