COMPARE AND CONTRAST.  The Chicago Tribune evaluates the roller coaster war between Six Flags Magic Mountain and Cedar Point.  The parks have comparable numbers of comparable coasters, which makes for an intriguing horse race.  The comparisons are unweighted, thus Cedar Point gets neither extra points for having a classic wooden out-and-backer, Blue Streak, nor for having the background of Lake Erie under clear northern skies rather than the High Desert under that warm Californian smog.