I haven't used both of those pedals, but I have used Keo Sprints and the Max 2's. I like both of these, but the Max 2's are nicer, I'm my opinion. I like the wider platform on them, I like the security of the clip-in with the new metal plate, and I like that they (mine) don't rotate as I'm one-foot pedaling and going to clip in - they stay flat, making it a bit easier (my Sprints tend to rotate).

^ What have you folks tried to cure the squeaks some get with Keo's? I find when my cleats are brand new, they squeak a bit, but goes away. I've also used wax rubbed on the cleat/pedal and this has helped.

*My only experience with Shimano pedals is with 2-sided mtn pedals. I like LOOK pedals, but never tried Speedplays, Time, etc.