I like the Tubus Logo (original, not EVO) because it's relatively narrow from side to side (means overall your whole ride can be a few inches narrower. I also really like the lower rail because it allows for lower CG of the load and still permits a full range of options for mounting things to the top of the rack without interfering with the panniers. Lastly, the way the lower rails protrude behind the upper part of the rack means my rack light is more protected from being banged up when I'm schlepping my bike around at bike racks, etc.

UPDATE:
Two days after writing this I was hit by car at a four way stop. I was half way through the intersection before the driver to my right came off the limit line. The main point of contact was square on side of my rear rack. The car hit me hard enough that I was knocked to the ground. The rear rack was tweaked and a spot near one of the welds has cracked from the impact. Just thought some might be interested to hear what kind of damage can come out of a scenario like this. I will be replacing it with the same if I can get my hands on one.