well, mi not good in bikes but i'll let u know wat i noe..
RR - No more first hand stocks in singapore. No pro-arm, 37hp, Tyre is 90/80-17 and 110/80-17, weight is 120.9kg,
SP - First hand still available. Pro-arm, 39.5hp (claimed by honda, but 28-31hp is more accurate), Tyre is 90/80-17 and 120/80-17 or 130/80-17, weight is 122.4kg
I was gonna buy a RR last time that's why i did some research on it. But couldn't get enough cash to buy over the bike.. think it's sold now..

heard that the RR has no power cut.. not too sure about that though. but i would get it over the sp anyday.