Only plus of stock bumper plus adding the tire swing arm only - less $$ out of pocket initially
(Because you will finally step up to the full bumper w swing arms as your build evolve$ )
If only going a 2WD w no lift and the desire is to add a basement box then the swing arm only solution is the way to go.
There is no close comparison to capability / capacity / functionality of the full bumper w swing arms. The side support bars, built in lockable storage compartment, flat step surface, protected reverse lights, and ability to add a bumper box with true ability to handle some weight (due to the wrap around side support bars) are what is gained.