I think primedice should be the best because it provides us with free btc from faucet. There are some people who earned a lot of bitcoins from the faucet. Its great that only luck that helps us in earning lots of btc.
The reason you give is kinda funny, best because they provides free btc from faucet? Are you sure, do you think other sites does not provide free btc from faucet?
Give better reason to vote them as the best gambling site, I believe PD is not the best because of their faucet. If they are the best then there must be some better reasons.