I'll throw in my own opinions, and that is regarding the main question purly a matter of subjectivity. While the west adorns Alexander, if I've understood it right, and from what I've heard, in the east he is seen as a vile monster and butcherer. And so I will say that from my personal experience, Hitler was the worst of them. However I am also aware of my biased view and that other people, who historically had to feel the not so gentle side of Alexander, and probably were never touched by Hitler, likly have another opinion.

That is not to say that I can consider Alexander to be a "good guy". He was a person of his time, just like I belive that Hitler was a man of his, although neither of those can excuse the actions of either morally. I do not belive that either of them for long were primarly motivated by anything save the quest for power and glory, in which I think that Alexander took the leading in being lead, while Hitler most likly lisened to his hate to a larger degree. However one needs also to keep in mind that the people of yesterdays, both regarding the European 30s and 40s, but even more the ancient times, were vastly different from our own times in terms of ethic and moral views.

In short: Hitler was worse than Alexander, but that don't make Alexander a "good guy" in any way.