On my website I use the shopping cart widget.That means I have no choice, because there is (still) no gallery view. On my AW, I use the gallery view.
I think it depends on 2 things:
1. How many pictures you have! With only a few pictures, it make no sense to put them in different galleries. If you have many pictures, and people have to go through too many pages, you maybe loose them.
2. Different subjekts or styles! Depending on what you do, it can make sense to use galleries for different locations, color, black and white, subjects, etc
Colin Utz
http://colinutzphotography.com