Which one?

[ET Warrior]

I played KOTOR 1 approximately 20 + times.

 

I played TSL once.

[Totenkopf]

I'd have to say KOTOR, due to a more rounded out storyline and slightly better characters. TSL has a greater range of game options (upgrades, powers, etc...). I've no idea, though, how many times I've played either from beginning to end.

[Rabish Bini]

Kotor by a massive margin. My Kotor II got glitched up and made the game unwinnable. Sure, it had new Force powers, feats etc. but it was too repetitive. Kotor was more fun, and had a better feel to the game. And Nihilus was a sissy.

[Char Ell]

I've gotta go with KotOR. I liked a lot of things Obsidian did with TSL like the robes, improvements to upgrades, influence (good idea but too confusing), etc. but I found KotOR's storyline much more compelling. Also, like ET Warrior, I've played through KotOR several more times than I've played TSL.

[Q]

I adore both of these great games! I give the win to KotOR1 because of its "completeness," but that may change when the TSLRP is completed.