Hi Mate,

I guess the simple question is - what sort of riding do you plan to do, road only or both on and off road ?. The R is a enduro bike the X is a motard road bike. I'd say. Sure they can be modded any which way as in you can make a R into the road bike and X into a dirt bike etc. So, if you're happy to go with what Yamaha intended, simple rule - R enduro, X road.

PS I've had both the R (2010) and the X (2009).

Cheers
Glenn