Probably a short saber/cutlass. Very quick and versatile. Also, saber is the coolest word ever.
Either that, or an Arming Sword. Not as clumsy (to my mind, anyway) as a long sword, but not as stubby as a short sword.
Either that, or an Arming Sword. Not as clumsy (to my mind, anyway) as a long sword, but not as stubby as a short sword.