It seems to me that the addin is better because one can apply a Material to the import. The native method does have an advantage of perhaps being more robust for huge OBJs, but meshes that big will overload Revit and make it very sluggish. Of course, native is included in Revit 2022, so there is no extra cost for the software. Revit before 2022 does not have a direct way of importing OBJ meshes.
Here is a video I made showing some comparisons: