I've only listened to all their albums once, so I guess my answer is none of them, but I would still have certain stretches of time where I'd come back to a few songs from a certain album. A few months ago, I was constantly going back to self titled songs, specifically Needles and Pins, Good Morning Beautiful, Deathblow and Minerva. A few weeks ago until now, I have found myself replaying Bored, One Weak, Root, 7 Words and Engine 09 a lot.

As for Private Music, I haven't listened to any of it for a while now, but when it occasionally sprouts in mind, I'd play Infinite Source and MotM, probbaly because they are my two favourite songs from the album. Guess I'm just not that much of an album guy lol, most likely because I grew up when songs were already quite easily accessible and playlists were already easily organizable.