From my own experience, I can say that now most platforms have switched to more or less the same software from large providers such as Pragmatic or Evolution. The main thing that you really should pay attention to when choosing is the speed of loading the games themselves on your smartphone and the absence of freezes during live broadcasts. If the mobile version lags or the lobby takes a long time to load, then there is no point in playing further, no matter how many bonuses are promised on the start page. Personally, I always open a couple of demo slots from the mobile Internet before even creating a profile anywhere, because a stable connection usually decides everything.