Do you even realize that it’s just there slogan? Being the best is very subjective and probably they are the best in there own way. Slogan is a form of advertisement which means it’s normal that you will see some sweet words in there to attract there customers. It’s not there Faqs or ToS which they are bind to put only facts about the casino.
I think there Rollbots and other casino perks is what makes them rewarding and not the RTP for each game because it was set by the provider and not the casino.
Lol , are you a player of rollbit? if not then better check their site first before saying that it is only their slogan,
yeah mostly it is how they lure players but if players like OP is telling you this meaning it is based on His own experience .
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But OP best that you check each site first than just listening to what people tells you here , better to use those shared sites just to be reference and then it will be better for your decision to climb on.
Any casino site could proclaim and assume that they're the most rewarding site but we players, could testify about our experience on them. It will be risky to listen to everyone's opinion because we have different preferences so it would be better to do your own research so you can pick a rewarding site based on your personal target reward.