I have had both, both on 12k+ trailers.
I liked the Dual Cam. It made the setup super stable. So much so I did not miss my Hensley, which I sent back after it self-destructed.
I know have a Blue Ox. It was a couple hundred less than a replacement Dual Cam system, but more importantly did not require any special setup if I had a major change in loading of the van like the Dual Cam did. After owning it, it's now my preferred hitch. It rides better and makes less noise, besides having simpler setup.
I have not had any sway with the Blue Ox, but I didn't with the Dual Cam, or EZ lift, or no weight weight distribution. It does NOT prevent the bow-wave effect like the Dual Cam does. However, only about 10% of the trucks I pass even cause that, and it only takes a slight steering correction when it happens.
