I have both Carousel and Fortress running at the moment. Fortress is creating a sort of Fubar / Titan Panel thing across the top of my screen with the stuff I like to see at a glance. Carousel I use to hold the other stuff (items I don't normally need to see, like BugSack and similar things).
Besides the difference you noted about the display, the only other big difference I found is that fortress blocks will automatically alter their width depending on the data being displayed. Carousel seems to be fixed width and does not alter (which can result in data being unviewable if there is a fair amount of it).
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