I quite like to have both and I decided to include them for different reasons:
1) sometimes I have to find closed issues that I created or fixed;
2) I don't usually have many issues assigned to me or that I have created that are still open (<20), so I can easily count them and know total/open/closed number with just a subtraction;
3) I can get an idea of how much work I have to do just looking at the page(s), even without knowing the exact number of open issues.