I've lived in both countries, and by far American chicks are the sluttiest (I love that), and they're alot more fun! You don't even have to try...they come up to you at the bar and give you their ###!
You have to work too hard for Canadian broads (unless they're fat).
I know that's what I love about American women, plus they are so sexy and independent. But I heard Canadian girls are even worse they'll jump at you in a bar.