@op, well, I have played on gamdom casino a few times and I can indeed say that I love the design of the casino, I agree it's definitely one of the best when compared to other  very popular casinos like stake, bc.game and so on, but all the same, I would say that a casino being the best doesn't have to be all about design, other factors like functionalities, features customer support service(like you mentioned) are also very important to consider.

For me, I still will stick with Stake as my best casino, aside from design, which I find not so much interesting since I am not a lover of black, Stake have been serving alot of people on that online gambling community for so many years now without issues, they've grown to become the top casino in online crypto gambling, I always admire their success and hope that some day, I build a company that is as successful as stake it.