Difference between the words "best" and "top"

muffincrumbs

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I feel like a long time ago, when the web was a jolly place filled with rich anchor texts and 1000 words of black text on black backgrounds, the word "Top" was used and optimized more in our industry. Sometimes when i search these words get transposed as they (can be) synonyms.

Now it seems like we are looking for the "best" more than just "top online casinos" so I went to the google k/w tool and found it is not working for me.

Anyone have a suggestion to a good keyword research tool that is free, and how do you feel about top vs. best and how they have changed over the years?
 
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