Straps=>Aerolites=>Keo Classic=>Speedplay=>Dura Ace=>Speedplay=>Keo Blade 2
All the criticisms and advantages of each system seem true to a certain degree, but they all seem to work very well actually. I still have a brand new pair of Speedplays and my good pair of Dura Aces in my closet because I am always considering going back.
I spent most time on Speedplay (10+ years) and never pulled out inadvertently. I also never had any bearings go bad. But I did get a small amount of rocking with worn cleats. I've used all the versions of speedplay. Again, all work just fine with minor feature differences.
Dura Ace is definitely the king of "bulletproof". but are heavy, and the float is very sluggish, even with the "float cleat".
Speedplay is the easiest entry and freest floating. Float is adjustable on the Zeros.
Keo Blade 2 is a good compromise: light, easy float, and wide platform. But fragile (documented in the separate Look Keo Blade 2 thread) and cleats occasionally squeak/groan. Odd entry that needs some getting used to.
If you are a very powerful sprinter and/or just want to never think about your pedals, go DA.
If your knees need light float, or you just want dead-nuts easy entry: speedplay.
I'm using the Keos, so I obviously think they are a pretty good combination. But they don't seem the best in any category. They are light, but things like the Aerolites and Xpressos are actually lighter.
Time also seems to have some advantages, but I haven't used them. I hear good reports.