While I've read a few chapters of Kakegurui - Compulsive Gambler, I can say with certainty that Twin has given me a much more enjoyable reading experience. Twin follows Mary (or Meari, if you prefer) when she first starts attending Hyakkaou. Like Yumeko, she makes a strong entrance by beating the class bully. Unlike Yumeko, however, Mary feels like she's actually trying to strategize and win. In general, Mary was much more likable as a main character, and following her journey through Hyakkaou was beyond riveting. If you wanted Kakegurui but less horny, I believe Twin has got you covered.
Also, Hoshizuka is for sure gay for Mary.
Kakegurui Futago