To all who've replied, I am thankful to the responses. I took everything you guys said and starting to analyze how their UI/UX caught ya'll liking. Took a screenshot of their designs as well to help my progress. But I hope the discussion remains flowing and focused only on their designs and how you felt about it.

I really appreciate those who said they liked platforms because its simplicity and you prefer the game they focused (such as sportsbet and primedice). But I want to clear out that my goal is to at least create the best UI/UX of platform out of your guys' opinion. Yes, some old and themed platforms are good, but if a casino offers all of the games, then something can be better (or even best)

Meanwhile, Rollbit Roobet Duelbits Stake are the most common and popular casinos that offers all games and with a great UI/UX. But I know that there can be a conglomeration of all of those platforms as they all have flaws and not everyone liked those either.