I would agree 99% that the OP's intent is to promote the casino that he/she mentioned.
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But to answer the best game provider, I will go Pragmatic Play or Hacksaw Gaming. Why? Simple, I enjoy almost all of their games, mostly slots. Their slots has very good design (IMO). I don't know if they are the best in terms of RTP, but I do not care much about that.
Yes they've good games both, but unfortunately they've very low RTP too, especially Hacksaw Gaming. I don't think they have a slot above 97%, they are all below. For me it's too expensive, they should change that, if they want to attract more players. Live table games have higher RTP why they need to pay dealers, shufflers, video stuff, etc.