I started out with a Duplex, but it had 4,000 miles on it, and sprung a serious leak. But otherwise no complaints about
it. I just decided to try the Durston because the additional head room looked attractive to me. I prefer the horizontal space of the Duplex and the vertical space of the Durston. If dry, I'd go with the Duplex. If rain or humid, I'd go with the Durston.