If you are newer,you may find them quite similar in performance.Once you get a taste and feel for performance,you may want to look at some differences in the airframes,but it also depends on brand and set up.
Overall the Extra has been voted to do the precision stuff best,and 3d well,so does the yak,with the Edge doing a great job at full on 3D.But as stated,it depends on company and set up,its a very loose and general observation on my part.