I like choice systems, though I tend to be more picky with morality systems. I love Shin Megami Tensei because the choices tend to have more far reaching consequences and the game never tries to strain your choices into the silly paradigm of good vs. evil, instead focusing on Chaos ( Freedom but suffering), Law (Security but with loss of identity) and Neutral (A balanced approach but one that always repeats the cycle of conflict) which I feel says more of a person making the choice than choosing whether to save the helpless people or shoot them in the face.

I also like how the CT game would allow doing certain actions could change the game in small and big ways even if not all of them felt like they were important to the plot.

I liked changing Terra's motivation by choosing whether to take Banon's offer to join the Returner's or flounder on it. It adds a lot of character to her.