The Light Cannons are very nice lights. Vision X updated their internals within the last year or two so they really do work great and throw a ton of light. For mounting on the a-pillars, most folks are after longer distance since the lights sit physically higher on the truck. The Light Cannon single LED is going to net you that longer throw while the multi-LED will provide good distance but also more flood/width lighting. And with Vision X's wide array of snap on poly carbonate covers, it's easy to change the light to suit your needs for dust, snow, etc.