I think the main point is the ones I listed are solid enough to pry with and are small and light enough to carry in a pocket, bag or purse. While if we are ever trapped in a fire or earthquake, we might wish to have a full sized Hooligan bar handy, even the small ones would be awkward to carry due to shape and weight.

For what it's worth, I have a "real" 3' crow bar in a duffle under my desk at work (earthquake/fire). But that only helps if I'm at my desk.

-john