I've tried most clipless. I don't realy like the Shimano SPD's, they clog with mud very easily. I do however prefer the ability to change spring tension.
I do like the minimalistic design of the Crank Bros. but prefer at least some platform, so I do like the Candy's.
Never liked the Frogs. Walking and Hike-a-bike sections made the cleat clog with mud/debris. Did like the engagement/disengagement.
My favs are still my Time A.T.A.C's. Never clog with mud, small platform, decent weight. Don't like that you can't adjust spring tension, but I've never really needed to.
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger