I think you are right. The best casino for all is not the best casino for a particular gambler. Even two separate gamblers may have their own preferences when it comes to online gambling. That's why I suppose it is crucial to do a deep research of the website on your own before diving into it.
But suggestions are always welcome. It will now depend on our own factors if we will choose those sites. No need for crucial deep research. Being involved on their community thread like ANN or any platforms, should do. Users real feedback is already an enough thing to make sure that the site is true to their words.