I haven't actually duelled with a lightsaber, but I have done some boffer sword fighting. I'm more of a short-sword and shield type guy, but I sometimes use two short-swords. Also, I'm a bit partial to having a longer hilt, because it feels more natural when I use it. Since my style is quick strikes and thrusts, the longer hilt really gives me that extra length to use. When I use two short-swords,I dance around alot and do brief charges, but I still end up using fast blows and jabs.
So I guess short blades with a shorter hilt, and a long blade with a longer hilt!