I choose the choices that are the most opportune to me at the time or in the future, as such about 1/3 of the time i pick light side dialogue options and 2/3 of the time i pick dark side dialogue options.
I dont try and play dark and lig, i play as my own character andi always end up dark side, not far from dark grey.
Also doing things like ordering those exchange thugs to jumo in the pit was a service to nar shadaa and should be considered a blessing by the people in the nar shadaa world isntead of a dark thing to do, i always was puzzled when that idiot that direct the thugs to you for money then runs away when i get rid of te thugs for him...pfff
Also, one question, when you talk to atris she unsheath syour lightsaber, you can declare as such in dialogue as well, when atton asksyou what colour your lightsaber is i alway say silver, so i know that blade atris is mine. My question is is it at all possible to get that blade from her? do you have to help her and shell give it to you? cause killing her doesnt makethe lightsaber drop...and thats really pissing me off :/