As all of you probably know, keyword research is one of the most important parts of SEO. It's essential in effective web marketing.
We can of course easily find many different ones on the internet. But I'm wondering, which one do you use and why?
My preferred choice is Google keyword planner. I never really tried any other because I never felt the need to. To use it you will need AdWords account. It's fairly easy to use and it provides so much information... from traffic estimates to historical statistics and so on.