Wow, that's hard to decide. I chose RNR for the thrill factor, but I love Splash Mountain. Not just for the drop at the end, I love the music through the whole ride!! I would ride it even if there was no drop.
Tough call, but Splash Mtn. has terrific theming, music, views, and, of course, the big drop....overall my favorite. Thank goodness we don't really have to choose just one though....