Naturally, the holsters hang down on the legs, so the lighter rig with the leg straps looks like it really has a pair of Blasters in the holsters. The darker rig would have to have leg straps added or the holsters glued down on the legs so they look realistically weighed down.
If you want a canonic Jango, you'd have to attach leg armor, too, but to be honest, I like the jackboots on the figure. They simply look classic and cool.