All other tools like Market samurai, Keywordanalyzer, etc. uses, Google Adwords tool for keyword related information, so I guess Google's SK tool is the more powerful tool than any other...
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The above post is Crud ^^^^^^^^^^^^^^
Googles keyword tool alone will leave you up $hit creek without a paddle more often than not.
The search stats are opften widly out
PPC figures are a joke for adsense (both ways - I've got page 1 number 1 paying 1/10th of what G says on some campaigns and had to pay 10x more just to get 6th spot on others - it really is a complete joke)
It doesn't analyse you competitions backlink metrics. THIS IS VITAL! Sometimes 20 good backlinks will completely dominate 20,000 average ones, you need to know anchor text, PR of the URL it's coming from , the "trust and age" of the site it's coming from..G takes all these into account when ranking you in SERPS - but gives none of this info in their joke of a keyword tool.
I'm not even going to mention any other tool - I'm not interested in any particular one, nor selling any - I just know from many years experience and literally hundreds of campaigns and website setups - that Googles tool is $hit!
It's not even meant for keyword research for natural ranking. It's meant to help adsense and adwords clients, and it's cocking terrible at it.
Scritty