To get a comprehensive and accurate picture of the search landscape, you should use a combination of different tools. Google Keyword Planner is the most popular and widely used tool for keyword research, providing keyword ideas, search volume, competition level, and cost per click data. Google Trends helps to analyze the popularity and seasonality of keywords over time and across regions. Additionally, Google Search Console shows the actual performance of your website in Google's search results. Other keyword tools such as Moz, Ahrefs, SEMrush, and Ubersuggest can provide additional keyword insights such as long-tail keywords, competition analysis, keyword difficulty, and content ideas. With this combination of tools, you can measure the effectiveness of your SEO campaign and identify gaps and opportunities for improvement.