I believe there is a good bit of apples vs. oranges conversation going on. I myself do not put an Andersen Ultimate or SuperLite 2600 in the "gooseneck" category. A gooseneck conversion is a whole different animal.
I think your best options are the Andersen Ultimate, SuperLite 2600, or Reese Goosebox. All require a gooseneck ball in the bed of the truck. If the truck does not have the OEM towing package with the pucks and a gooseneck ball socket, an underbed system will have to be installed. Typical is a B&W Turnover Ball. With a gooseneck ball you do not need the old style rails. The Andersen, PullRite SuperLite 2600 and Reese Goosebox go right on the ball. All you have to remove is the ball to have a clean bed. Takes longer to climb in the truck bed than to remove the ball.
The 5th you are shopping for is relatively light. Any of the 3 systems will work.
I personally like the simplicity of my SuperLite 2600 versus my previous conventional Curt hitch. I don't have an issue with the Andersen aluminum construction but the PullRite is steel. It is a bit heavier than Andersen but I can install and remove it easily at 69 yrs old and with 3 back surgeries.