Predominantly I'm a dual wielder.
Sometimes I double blade, others I single wield (classic look and in TSL it has the thrust/stab motion that way). Really I do them all. Cuz it's fun.
In KOTOR I tend to prefer blue and either green or violet. Until I get near end game, then I use MotF (turquoise) and HotG (red-orange with yellow core).
TSL I use whatever I can get until I can get the silver crystal or the orange crystal.
Power crystals? Well that's the thing. I usually have multiple sabers. One or two for dealing droid damage, at least one for deflection of blaster fire, one or two for pure brute damage.
We'll murder them all, amid laughter and merriment...except for the few we take home to experiment!
"I cant see S***! --YOU GO TO HELL!" --Tourettes guy