The RnR is definitely a thrill ride the whole way through, and the initial launch is truly amazing. I like the TOT a little better due to the effects and the anticipation of the drops. Both are outstanding thrill rides though.
I think initially, ToT, think back to your first time... in the dark, you know it's going to happen... just not when! (ps. the air you make in the seat belt chair! whoopeeeeeee!)