IMHO:
636=much better street bike,
6R = much better race bike.
I know this is over-simplification, but it's pretty much what the 'argument' boils down to. FWIW, if you consider a 636, I'd try to confine it to either the '05 or '06 models; I think these were the best. Mainly due to the suspension upgrades.
Starting in '07, Kawasaki made the 6R a more track-focused bike, and that trend has continued. Now, I cannot dispute that the newer engine has more power, and, on paper, "beats" the 636 motor. But, in real-world application, the extra torque provided by the extra displacement works much better in typical street riding.
I'm sure there are other benefits of the newer models as well, such as more areodynamic bodywork, frame, chassis, and brake refinements/upgrades, but none that translate to a better "all-arounder".
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Kawasaki to me baby!
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