In the case of marketing strategy, any site are free to claim themselves as bla bla bla but players are those who decide whether the claim is true or not.
There are many casinos out there that claims themselves as "the best", "number one", etc so I can say that it is a normal practice by casinos to attract players.
What you need to do is to find it yourself which casino suits your needs/preferences.
If you are looking for rewards offered by casino, you can simply compare it yourself by visiting them one by one.