In the hagadah we seem to indicate that Lavan was a worse enemy of the Jewish people because Pharaoh only decreed against the males while Lavan sought to uproot all. Based on this logic it would seem that Haman too is worse than Pharaoh for he also sought to uproot all (and perhaps worse than Lavan for he sought to kill many more people). However in practice the only one who actually killed any Jews at all (as far as I know) was Pharaoh, which I think would make a strong case for him being the worst.
Is there a source which definitively states which of these three people was the worst enemy of the Jews?