What's your problem? If you have degenerative arthritis, go with the traditional form. If you're young, and your bones are growing, you could consider the mini.
What I do know, having seen my mother through three hip replacements (One of them didn't work, the Dr. did a new style, no cement replacement, which, as mother had degenerative arthritis, flopped.) is DO YOUR EXERCISES!!!!!!!
Mother's doctor told her to do them as steadily as she practiced her religion. Mother said she wasn't very religious, so she'd do them more.   
The best Irish step dancing I ever saw was mother after her second hip replacement. Michael Flatley's technique may be better, but I never had more pleasure watching anyone dance.