I go with SDHQ brackets and Baja Design lights.
My ditch light with SDHQ bracket and BD Squadron Sport took a pretty hard tree branch going ~60mph down the trail one time. Not a scratch on either. Not even the BD Rock cover was scratched. If I had a more flimsy bracket or a light from a company that has no racing experience (aka, 100% of the cheap brands you find on Amazon)... I'd be looking to get a new windshield already.
That said, you can mount a pair of BD LP4s on the ditch position. That way, you will get forward lighting AND side lighting. However, LP4s don't shoot far. If you're looking to see far, get a set of XL Racer or XL Pro in spot pattern. Properly designed lights are not "bigger the better" or "brighter the better." Properly designed lights put the output where you want it and not just spread the light around.