For all of you who use clipless pedals on your touring bike, what works for you?

I am trying to decide between the Shimano SPD pedals (M530) with and without (M520 or M540) the platforms.

On my current road bike I have Look Keos and I love them but I wanted to go to SPD on the touring bike so I can wear shoes I can walk around in easily.

TIA for your thoughts!