Kunwar Amar has shown more than one style. He did contemporary with Shakti in his first duet, then tango with Parvez and Kruti, then aerial act with Shakti, then bhojpuri salsa with Kruti, etc. So it;'s not true that he has shown only one style... Both Parvez and Amar are equally good to me, and Parvez shines more because he had the chance to do more solo than Amar. A dancer stands out with his or her solo acts most often and proves their caliber through solo performances as they get full credit when it's executed well...
That being said, Parvez is my first choice to return through the WC round, and he totally deserves to stay!