Do we know how/where the bike will be tested? If they are looking for something to test on a track vs. off road, it should influence our choice. Without factoring that in, my choice is the 450X also.
How sweet it would be to buy a copy for my buddy (since I know the X will win
who will argue till the cows come home about how much better of a bike the 450R is than the X for desert even though I don't think he has ever ridden either one.