Planetes 1-26
Reading this after watching the anime, I couldn't help but constantly compare everything to how it was in the show. It lacked a lot of the things that made me really like the anime; the cast of characters was really pared down, the romance part was over pretty quickly, and there wasn't nearly as much focus on the world as a whole--no UN, nothing about the company they worked for, and the Space Defense Front only showed up a bit in the first half. At the same time, it didn't have a lot of the parts that made me rage, like Hachiken being an asshole for half the show and the unsatisfying resolution to the resources conflict.
It was nice seeing Fee get a bit more time in the spotlight. I could have done without the wacky guy who thought he was an alien, but it was still a nice touch to leave the question of whether he was lying or not unanswered. Hakim's appearance confused me; it seemed like we were supposed to know who he was when he showed up at the training facility, but I don't remember him showing up before that. Most of the goofier comedic elements weren't present in the manga (no ninjas on the moon), and I'd say that was for the better. When you're trying to do hard sci-fi, moon ninjas bouncing around doesn't help. Still, the manga suffered because it just felt somewhat empty and less fully realized.
Something both versions shared was a feeling of sadness about progress and development. It's not like the terrorists were portrayed as being right, but things just never turned out completely happy. Space is cold and lonely, and the astronauts were all cold and lonely people at some level, even when they did have connections back on Earth to keep them grounded. It's not a series that leaves you feeling really good about humanity in either format.