So far the casinos I have visited all had good user interfaces, I haven't found any bugs or slow downs in any of those casinos UI and that's why it's not possible for me to favor one casino and degrade the others. I can say that I have used new casinos and well established casinos and in all of them I found the user interface quite good and responsive.

I may like one casino over the other but not because of UI but because of the features they offer. I mostly use sports betting and that's why I like the casinos that offer sports book, but sometimes I do enjoy the games that casinos offer. In most of the casinos sports book is quite well created and easy to use so that's why I won't name a single casino.

I used to play aviator but I found that game non useful because I have lost a lot in that game. Now, I prefer sports book more than casino games, it's my general preference, but I have found that all casinos have good games with very responsive UI's, I think one should find other features of a casino and should give less importance to its UI.