Was debating which of these two games I should install on my PSP: Steins;Gate or Zero Escape. Both of these visual novels I really enjoyed and only yesterday I finally unlocked all the endings in Steins;Gate. But I finally went with Zero Escape: Virtue's Last Reward and Zero Dilemma because the save mechanism allows players to jump in and out of the story to revisit/reply different points/ fragments of it; a bit like how consciousness can time travel in these stories! So its "replayability value" is a lot higher.
With Steins;Gate, though, it is quite hard to do that given it's save system doesn't facilitate that. Also, I can watch the excellent anime on YouTube! Zero Escape is, actually, a bit like Tactics Ogre in that you can jump around after having completed your initial playthrough. So now I have Zero Escape on my PSP and ... the Danganronpa trilogy on the PS Vita. It turns out I have lost the save for Trigger Happy Havoc so one day I will play that again. Excellent game and, arguably the best of the trilogy.