Let`s just analyze...
One Saber - classical, when using feat gains +3 AC, the game isn`t hard.
Saber Staff/Double-Bladed Saber - more dmg, penalties to Attack Rolls withot feat
Two Lightsaber - more damage than one saber(x2), penalties to Attcak Rolls without feat, We may have difirent crystals for both sabers
I`ll play with one saber, but Two Sabers are preharps better choice, who knows.