It's hard to me to say where my games shine the most, since ultimately it's the audience who decides whether or not a game is great or not.
As I am both a novel writer as an RPG developer, I guess it comes to no surprise I am pretty critical to myself when it comes to story telling. As a matter of fact, it always means a lot to me when I notice people feel joy when the "heroes" of my stories feel joy and feel bad for those "heroes" when something bad happens to them. After all, that means my story and its characters somehow got people and that I basically did a good job as a story teller.
For example I once showed a part of my Star Story game, and at the start something happens that brought the main heroine Wendicka to doubt herself even to the point where she wanted to end her entire career even though it had only just begun. That person actually felt bad seeing Wendicka being like that, and that meant she actually felt sympathy for her, even though Wendicka is only a fictional girl born out of my imagination.
Now, not all my games are story based ("House of Cards" for example is just a collection of card solitaire games, and I also have some puzzle games, as well), yet I guess my story based games are the ones in which I try to shine most as a story teller, yet in the same time trying to offer a challenging game.