The nicer one: slightly smaller exterior dimensions, looks like powdercoated black steel, or at least, black steel. 2" hole space outside of the bench zone, 1" hole spacing in the bench zone. Pin and pipe catches, very nice oversized J-hooks, needs to be bolted to the floor, pins for resistance bands, and two different sized pull-up pipes at the top.
The homebuilt one: wood, either 4x4, which would be a little larger external dimensions, or 6x6, which would be much larger. J-hooks made of pipes and pipe fittings, which I'm a little uneasy about. Holes would be 2" spacing at best, if not 3", to avoid blowing the wood apart between the holes. Catches would be single pipes, no pins.