We 99.9% of the time put our left foot down. We use "our" method for starting and stopping. Unclip the left foot prior to the stop and have it ready. Make the stop with our left foot down. Move the right pedals (in sync) to the 2 o'clock position, push off with the left foot, clip in and go. Part of this comes from our motorcycling days. I would always stop the Goldwing with the left foot down and then put both down, needless to say on a big motorcycle the co-rider stays put.
Wayne