In fact, I think you cannot rely on anyone Keyword Research tool as such because, in the long run, the search behavior keeps on changing and also fluctuates from country to country. Keeping all options open for a global traffic and targeting for the maximum possible targeted keyword phrases should be the aim for the keyword research phase.
Instead of focusing on only the keywords recommended by keyword research tools and Adwords also concentrate on the possible psychologies of users from various geographic areas unless you are concentrating only on a very particular area where only the language and slang of that place concerns for the search of that site. Online users from different places, of different age groups and the various educational backgrounds, think differently and use different language and jargon.
Instead of focusing on only specific fixed key terms we should work to keep the possibilities of a wider circle of permutations and combinations of key phrases open for the site. The analytics data, in fact, can give a proper meaning of what searches are actually taking place countrywide.
Anyways, very informative article. Delivers some great points to light…