I like to go for users review, very important. If I do not see excellent customer review about a casino customer care, I may decide not to use such casino. I even do it to the point that when I register, I will still try and message the customer care for support to help me in one or two questions, just to know how fast and responsive their customer care are, because if anything go wrong, their customers care would be the last thing that would come your mind.
Here's another thing, when reading user reviews about a particular casino, to be sure that they are not biased, real and not dependent, but how in fact it can be sorted from customized or promoted reviews and this can be confusing.