at first, thought this was a silly question, then thinking about it, things go on 'auto' for me, and always dependz....
if there's a curb available, I look for a clean area and unclip right
if no curb, most roads/streets have a crown dropping towards gutter, so unclip left, just easier.closer reach.
If at a stop sign or I expect the light to turn green in a few secs, track stand
if unexpected and sudden stop, and have possible wheel overlap, unclip same side as rider in front of me.
Ride On
Yuri