At one time or another I've had all of those, except the fiberglass cap (my hard tonneau was fiberglass), and you left off "steel caps". I won't ever use the soft tonneau again because if you don't have some "ribs" across the bed to hold it up, water will collect and weigh it down in the middle, and the ribs are too much trouble to be worth it. My personal preference has been the two aluminum caps I've had that not only opened at the back, but also on either side - easier to get things out of the front without crawling inside from the rear.
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