What is the best tool for competitiors analysis ?

[sandegownc]

For my website if i want to check competitors , then which tool and way is best who provide assure results?
Please do some most useful tools suggestions which 1 you are using.
As i have seen Competitors Analysis (CA) is the very important to make analysis who are competing my site .

[TechnoBear]

Please search the forums before posting, as this question has been asked and answered many times before. There is a current discussion thread here:

http://www.sitepoint.com/forums/show...-Analysis-Tool