Insetad of a firm opinion, I'll give you some facts: hopefully without too many spoilers.
RnRC starts with a very short, very intense blast off burst, but that blast only lasts a few seconds. The ENTIRE ride only lasts 82 seconds! it is important to FOLLOW directions to KEEP YOUR HEAD firmly planted against the headrest during that blast. I the darkness also = you can only see small portions of the ride at any time. If you want to know a little more about the specific loop styles, they are called a sea serpent and a corkscrew. As loops go, they are milder than some other loop styles. The whole coaster is fairly compact. Blast off = 0 to 57mph in 2.8 seconds.
Oh, and as with any coasters- both RNRC and EE have a kind of firm breaking at the very end of the ride that can be a bit jarring. You are at the end of the ride, going relatively slowly, then all of a sudden you feel a hard jerking.
EE on the other hand, as multiple parts that are a bit intense. It has a big lift hill plus a few other short stops that intensify the psychological impact of the intense portions of the ride. You know when you go up the lift hill...clickety clackety.. that whatever goes up must come down. EE is almost three minutes long (170 seconds). The track is 4,424 feet long. Interestingly, the top speed of EE is 50mph - so very close to the top speed of RNRC, but I think EE's high speed sections last longer than RNRC's.
Whereas RNRC only has the one blast off. In that case too, you are warned. Actually, while you are in line you get to hear+see a number of other folks being launched.
All that said, BOTH RNRC and EE are much smoother than Space Mtn.