Vote for your favorite. I vote for CW.
Both are must-have publications for any serious collector or dealer, chock full of current info about everything numismatic. But I have always felt that NN's articles tend to be more interesting. Yet, CW's ads pull better, dollar for dollar. Both publications have gone CAC crazy, re:ads that heavily push CAC coins and articles that report about them.
Does anyone even refer to CW Trends now? CW has not even called their price guide "Trends" since 2002 (an inexplicably bad move on CW's part, given the widespread acceptance of the brand name). And I have never heard a collector or dealer refer to NN's version of Trends, so I am unsure about why it is even published.