Bill, Chances are all three were made by the same factory in China. So probably any of the three will work. With that said, I would recommend a full size 6" or 8" jointer. Now I know your shop is in a shed, and you don't have room for a full size jointer, but if it where me, I would make the room!
With a jointer, you are limited to about twice the length of the table size to the board you are jointing. So the longer the table, the longer the board you can joint.
I have my 6" Delta jointer on a Mobile base, so I can roll it around if I need to.