2008 rm85 or 2011 yz85 with pics

[pro65rider]

whats up guys. hows your day/night goin so far? i had a question. me and my son just sold the 65 and were moving to 85s. we were between a modded 2008 rm85 or a mainly stock 2011 yz85. he's 4'9 and 85 pounds. he's a racer and i would say he's a intermediate rider. we really like the fact that the rm85 has so many parts on it and extras but there frames are known for snapping. the yz85 is newer and not ridden as much and as hard.and the whole no powervalve on the yz85 really doesn't effect him since he stays in the power and uses his clutch in corners.and either bike we go with we will definitely be shaving the seat so he can be flat footed on both sides. i would also like to know which bike is smaller between the two. we really want more of a second opinion then facts here are the bikes were between

rm 85- http://losangeles.craigslist.org/sfv/mcy/4278687765.html

yz 85-http://inlandempire.craigslist.org/mcy/4278824361.html

help us out guys! and thanks in advance