What are the differences between Wieliczka and Bochnia Salt Mines, from a tourist's perspective? I'm interested in their overall impressiveness and geological and historical significance.
It looks like Wieliczka is closer to Kraków. It's hard to tell from the articles linked whether its mines are more extensive or if it simply has a more detailed article. (If Bochnia has an underground lake, it's not mentioned.) Bochnia mine shafts may run deeper below the surface.
I would prefer to visit one or the other. What are the pros and cons?