Do you want a hamburger or filet mignon?
I drove 7 R-Tronic R8's and 4 S-Tronic R8's before purchasing my 2014 R8 V10 with the S-Tronic Transmission.
The R-Tronic taste good and will satisfy your desire but the S-Tronic just melts in your mouth and makes you want a second helping. More Please!
IMO the S-Tronic is the icing on the cake and it's very sweet.