everything is different from the different situation so we could not underestimate each and every site because each and every side should have special and unique features in that for the investors so I think everything will be good for me to invest.
Good to invest ? Are you sure ? Are you going to risk your money just due to OP's list and ranking ? I guess you are completely deceived by some gambler who must have shown you some made-up proof/story of winning big from gambling. Never believe anyone when it comes about gambling and about making easy money from gambling.
You should do a research about how much chances are there to win by gambling at any of the given sites. I bet you would find it not very easy to win on one that the other. There will be a difference in the degree of uncertainty on each site which can give you an insight in to how do these top Bitcoin casinos play with your mind. Only some out of many would be genuinely designed to entertain you.