A good narrative is a wonderful find, and my favorite genre if I have the time: just as I imagine they take a lot of effort to write, it also takes more effort to comment on them (as opposed to leaving a straightforward comment along the lines of "You walloped the Turks/French/Russians good! Attaboy!") - at least, if I want to leave a comment that digs into the story and the characters' actions.
So when I'm shorter on time, I gravitate towards gameplay and history book AARs. Gameplay per se doesn't interest me a ton (although it is nice to read about the game in action, since I hardly ever play the blasted things...), but if there's a nice hook, such as
CatKnight's
Random World Order, it makes for an entertaining ride. History book is nice because hey, I like history, and it's always nice to see how the game world diverges from our known history - and see people attempt valiantly to explain why early medieval France occupying the Scottish Highlands is a rational thing to do.
Comedy is nice and there are some AARs that might not be comedic masterpieces for the ages, but still are fun to drop in on, much like a daily comic. Finding AARs that sustain a high level of comedy throughout their run is a rare treat, though.