if you go with something that occupies both hands, in kotor, dual-wield is somewhat better than dualbladed, due to the crystals... tho dualbladed sometimes deal more dmg, dualbladed can deal enough, but give more to stats, also it looks a bit more awsome ^^
I tended to be the 1-handed jedi tho, since if you put feats into 1handed and give your char high dexterity, he'll (or she'll) be an unbreakable wall, very good defense... if you take that, and add master speed and master valor, or perhaps master armor (or whatever it is called), maybe all of them together (I used to pick Force Immunity before force armor tho) you'll be an even greater wall, and due to Master Speed, you gain 2 more attacks/round = more dmg... it also grants you more def.
if you play as Jedi Guardian (or start as one in Kotor2) this is the way to go, but if you (in kotor 2) want to get the prestige classes Jedi Weaponmaster/Sith Marauder, then dual wield for maximum dmg and stats, put more in Str and Con then (con for implants that grants str)
something awsome that you got to try in kotor2 is to be a sentinel, then become Jedi Watchman/Sith Assassin, you'll love the stealth
BORK!