My current favorite is The Last Heir: The Fall of Daria. Formerly, it was Zombie Exodus, and both Life of a Wizard and Choice of Robots deserves an honorable mention. The reason I like them all is they all feature prominent stat building (including character relationships), with those stats have a big impact on available actions and/or the success thereof. Building on top of that comes plot, characterization, imagery, and so on (and is why, for example, the Last Heir is superior to Life of a Wizard). Having good game mechanics such as these games makes me feel like my character is growing, becoming more skilled, and changing in significant ways. It gives me a sense of progression, that my character is awesome at X because I’ve been choosing to be that kind of protagonist.
It’s these kinds of things that make me prefer the Choice Of style of game to, say, a regular novel. Don’t get me wrong - I love regular novels and am an avid reader, but if I wanted just that, I wouldn’t be looking at a Choice Of style of game. The best Choice Of games combine these game mechanics with the best aspects of writing mentioned above. They are also why, I feel, writing these games is more difficult than writing a similarly long novel.