I'm right-handed and unclip right-footed - because I'm a bit of a klutz and it's just better to give the job to my more coordinated side - and also, when I got started, I liked the idea of being headed away from traffic if I miscalculate.

By the way, sometime during my brain injury specialist training, they told us that "handedness" is an ancient animal instinct - so that if you quickly need to defend your life, you don't have to decide which paw to use - it just gets out there!