As a general though Wellngton was more backwards looking than Napoleon and more modest in his goals and ambitions (as a general, again). Great men do great things, they are not simply successful. There are generals who have won every battle they fought but don't rank with Alexander the Great, Caesar or Napoleon. There are generals who have lost nearly every battle but are condidered great (Geo. Washington-- though I don't agree). There are generals who were ultimately unsuccessful like Hannibal, but who still rank at the very top.
In politics Wellington has been ranked towards the bottom of Prime Ministers. While Napoleon's civil achievements are still seen, by some (though obviously not by some here) as important, if not more so, than his military achievements.