With Leicas, f/1.4 to f/22, except when I'm using a Noctilux, and then it's f/1 to f/16, or when I'm shooting with the Thambar, and then it's f/6.3 to f/9. With 8x10, f/3.5 (the fastest I own that will cover) to f/64.
Seriously, I choose the aperture according to the picture... and the lighting... and the lens... and the camera... and the film speed... and the format...
If I'm hand holding, I'll generally favour shorter speeds over smaller apertures; unless I need enormous d-o-f I tend to avoid very small apertures with small formats; if I need shallow d-o-f I'll shoot wide open.
As Paolo said, I'd never even imagined such a question before this.
Cheers,
R.