hatton applies pressure, generally has a higher workrate and roughs fighters up better than mayweather and has a higher KO percentage. thats about it really and i could make a list of even more things that floyd does better than hatton.
hatton had the right tactic to beat tszyu because he swarmed him, out worked him and roughed him up. that is something that floyd couldnt do and in my opinion the best floyd could do against kostya is use his superior boxing skill and try and stay out of the way of tszyu's right hand all night and maybe pinch a decision.
and yes a KO victory is generally more impressive than a points decision. that is generally the public opinion mate.