No doubt there are a lot of Keyword Research tool in the market. Also, we don't know which one is best. So in my opinion select MOZ and Ahrefs these tools are best for me. I get ideas of keyword difficulty with MOZ and for search volume I prefer Ahrefs. As I work on my site for keyword research like best Korean shampoo for hair loss Moz shows me its difficulty is 16 but on the other hand Ahref shows me its difficulty is 2 and volume is 150. So I get an idea of keyword difficulty is from MOZ and get the idea of monthly volume from Ahref.
