I love RNR. It is more intense, more a thrill ride. If I could sit in front seat I could ride over and over and over. Aside from upside down loops it has a G Force of 5. I think it is the pressure on me that is so relaxing and feels like some kind of therapy. But I also love coasters, not afraid, especially in the dark.
I now love Cosmic Rewind. First time I hated it. I was sick even with seabands. I thought liking coasters would be enough but it's different. The visual with the screens does play in to the experience. It is smooth, fast but only like 2.4 Gs - no loops or real thrill to it (for me). Exciting, different, whipping is best I can describe ... but not so much you feel "slammed". Second time added medicine and by third time had it down and rode with nothing. Aside for the nauseous I don't think it has any of the scary thrill RNR has that would scare off non-coaster people. It is an exciting exhilarating ride!
They definitely tap into different adrenaline sources.