While I don't often wear either, Poste Haste is definitely the winner. It's hyped mainly (I assume) due to it being a Matte2 finish. They're super soft, and very pigmented, whereas more often than not, regular Mattes can be chalky and hard to build, Violet Trance coming to mind.
Poste Haste is a tad dustier, and darker, with Passionate being pinker and brighter. They're very similar in color, the main difference being Poste Haste is easier to build because it's a Matte2, and Passionate is tad tougher to build and blend. I dislike both just alone, but they are so gorgeous when you do a sorta mod look with them. A neutral, or pale lid, with Poste Haste/Passionate, Sketch, and Carbon in the crease is to die for. They are also fun to use as liners.