I think Bitsler is the popular and the best one with reputation since years back. They have a lot of players too. But some I know they have played on STAKE too.
Yes I agree in your statement. Bitsler is one of the famous gambling website and there is a new website called stake and I am currently observing the environment and I can say that it is a very friendly user interface that is not hard to use. Simple instructions and great features.,