It's hard to know which the best keyword generator tool is when there are so many to choose from
. Some would say that the best keyword generator tool would have to be a free one but some of the paid ones offer additional useful facilities.
Personally I think that the best keyword generator tool is one which offers the most for the least effort. A tool like this needs to produce results quickly and not leave you waiting for hours while it gathers data.
This tools should be one which automates your keyword research, not makes it more difficult and tedious. It should produce plenty of results for you to choose from and you should be able to sort the results by keyword, search volume and volume of competitors at the very least. Believe me, if you can't sort the results then you won't be able to make useful comparisons.
It's also useful if there is some sort of built in calculator which works out the strength of the competition which you're up against. Although you can do this yourself by dividing the number of competing pages by the number searches, these tools do use a more sophisticated method than that and are therefore likely to be more accurate.
The one thing you can rely on when using a keyword generator tool which does give you search volumes is that it won't be even close to reality. Every one of these tools which I have used takes its data from the Google search engine and even Google admits that its search data can be as much as thirty five percent adrift from reality.
Unfortunately, if you want to know what people are searching for, in order to pick the most popular keywords with the least competition, this is as good as it gets.
Before you pick your favourite keyword generator tool, shop around a bit, try the free ones and take advantage of free trials to help you make the best choice.