I'm torn between the two because I love both of them.
On the one hand, EE is more of what I'd consider a traditional coaster in that it doesn't do anything "fancy" like going upside down or anything. Feels like there's more variety to the experience than RnR, though with the switchbacks, going backwards, steep drop, etc... You can also get some great views of the park.
On the other hand, RnR has the fun blast of speed at the beginning and is an overall fun concept. My qualm with this one (and it seems I'm the only one on this) is it's hard to get the full experience once the ride gets going. I love that it's in the dark and the music, but with the sounds of the ride itself/everybody screaming/just being overwhelmed, I couldn't hear the music at all, which I was really looking forward to.