"England have been in great form, both sides of the ball. They have been exceptional tactically," North, who has 80 caps for Wales, told The Guardian.
"They have great line-speed, are strong defensively and they have good variation in attack through their kicking game and strike plays. Their matches this year have probably had a bit more rugby than ours and they are certainly in a good place.
"We have the opportunity to put ourselves in a great position. The boys know what is at stake and, come the weekend, we will have had the best preparation."
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North also said that Warren Gatland's side have not produced their best performances despite victories over France and Italy earlier this month.
"We made a slow start in France, then brought it back, and Italy was a tough place to go having made so many changes," North added.
"As Warren says, winning is a habit: ugly or pretty, you have to win wherever you go."
Victory for either side at the Principality Stadium would make them favourites for the title and a potential Grand Slam.
(This story was refiled to add dropped words in the lede)
(Reporting by Rohith Nair in Bengaluru; editing by Sudipto Ganguly)
