Offering the round gives folks some flexibility, and I certainly like that. For the CJ/TJ/JK/JL crowd, the appeal to these for me is in bumper mounted applications; however, the round housing with a square light inside it wouldn't be my first choice because for me, it would be more important to match the shape of the headlight lenses. As such is probably choose a light to replace the factory fogs that had a round lense as well.