United face Liverpool on Sunday in the FA Cup Third Round.
"It was a bad result last season against Leeds, especially considering the rivalry between the two clubs," Ferguson said.
"In hindsight I could have picked a stronger team. I won't be making that mistake this time."
That game was remarkable for the fact Liverpool led for 85 minutes, yet contrived to lose thanks to late goals from Dwight Yorke and Ole Gunnar Solskjaer.