Personal preferences...
I have seen people do it both ways. I think it depends on which is more comfortable for you. I know some riders that find it difficult to twist their ankle to the outside far enough to unclip so they unclip to the inside. Personally, I go to the outside. I don't seem to have enough room to the inside to get unclipped. Maybe it has something to do with the size of my foot as they are not petite.
Karen
It is a truth universally acknowledged, that a woman in possession of a bicycle, must be in want of another one.
My current love is a Kuota Kebel. Maybe I need a Kuota Kalibur so I can be more aerodynamic...
My poor husband....