I am in the SEO game for long. What Rank Trackers just shows you your position number.. With those tools, you may feel happy if you have moved up from Position 9 to Position 5. But did that improvement really matters? i mean if you are still not getting any results due to being not in "Above the Fold" pack.

Nozzle just shows you that along with your competitor movements alongside yours. This is really a GEM and get it if you are doing anything SEO.