Ferguson told Sky Sports News that he thinks his side produced a complete performance against the Magpies.
Asked if he thought the win was United's best of the season, he said: "I would agree with you. I think so.
"Although the second half against Tottenham we were terrific, but the first half spoiled the whole day. Whereas today I thought the whole game we were on top of our game in the sense of concentration, determination, all the things you want to see in a team that's going to win.
"It was a great result. To come here and win 3-0 against a really powerful, aggressive Newcastle team, you have to make sure you really perform and keep control of the game and I think we did that most of the time."
The eye-catching victory lifts United into second place in the Premier League table, four points behind leaders Chelsea.