Do what your body "naturally" wants to do.

I wasn't sure what my "natural" side would be in a panic situation, so I road unclipped serveral times and with out thinking, just put a foot down when stopping. Turns out it was always the right foot.

My husband clips left, I clip right.

Had a real close call the other day. Just topped a hill (did my best yet on the bugger) and wasn't thinking about the intersection and the car that was coming along. Just about went down, but my foot popped out at the last second, just after I screamed OH MY GOD!!!!. So, my advice is to figure out what foot will try to clip out in an emergency.

And it will happen ever so often the rest of your riding life! Usually when you least expect it!