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I've got pretty much all the variants across my bikes. Keo 2 max gets my vote, especially at the current price point. The metal base plate means they last much longer than the cheaper classics and easys etc.
Don't bother with the newer carbon blade versions. They are a pain to flip due to the lack of weighting on the rear.
And get cleat covers for walking purposes otherwise the cleats will die in no time.
Why? I've got Keos, but even I know SPD-R is basically better. Get a pair of PD-R550s