Choropleth Maps & Classification Schemes

Here are my two choropleth maps: one classified into quintiles, the other equal interval. Unfortuetly, visually there didn't seem to be much of a difference in these two classification schemes, and I presumed there would be. Looking at the raw data, the second lowest class in equal interval has 4 more states in this than quintiles. If the data had been more varied this would make a large difference; sending states into other classes, and changing the overall visual appearance of the map. If I had chosen 3 or 4 classification schemes instead I think that the difference in the two schemes would have been more apparent. In retrospect, I would have choosen a fewer number of classes.