The Iron Sword is the best looking sword, no question. All the other swords look typical cheesy fantasy. A true swordsman needs no showy 'badass' looking edges or carvings.. these curvatures only impede the proper execution of a strike. The Iron sword is the most aerodynamic, and practical. It does the job it was meant for. The higher end stuff, Daedric especially would be the last choice of the swordsman.
Iron sword FTW.