88 KX: great forks, so-so front brake, good motor that was a bit harder to get along with than the CR or YZ, chunky ergos.
Bill can claim whatever he likes about the '88 RM - nobody will be able to disagree with him because they sold about half a dozen of them...
Dean Burt has an amusing story about his 89 RM back in the day.
The KX was widely considered the best all-round 250 in 88. The CR had a great motor but crap suspension, the YZ had no top end power and everything else was good but not exceptional enough to make up for the motor, the KTM was still too European, and the RM was way too late to market (so everyone had already bought their bikes, and nobody bought the RM).