hey kolasew, Google adword keyword tool is best among all other tool. It tells about competition, local or global searches for keywords and many advance options like location, language, broad, exact searches etc..
You may use google adwords as well. Also, if you are looking for long tail keywords, then you can also try using Long tail pro.
Google keyword research tool is good for keyword research. Most of SEO Professional are use this tool. http://eliteinfoworld.com