I dont think the word "class" can apply to either one of them. However, I don't know them on a personal level to say much.
Base on "The Simple Life," (whether it was scripted or not) i think Paris is a lot nicer. Nicole is kind of rude and mean, and i hate how she curses a lot. What's up with her calling everyone "*****"? I just don't get that.
Base on their style, i think Nicole has much better style.
Base of what we read from the tabloid, i think Nicole is nicer to people around her comparing to Paris.