I replaced my factory fogs with the amber SS3 MAX kit from Diode Dynamics and am very happy with them. They put out a lot of light. Comparable to the factory low beam lights. They have a very sharp cutoff so they do not blind oncoming vehicles nor do they create a harsh reflection off road signs like off road lights do.
In the past I have installed quite a few Baja Designs Squadron pro's, sports, as well as the S1. I am a huge fan of those and actually will be installing some as off road lights on my current truck at some point. For fog light application however I think DD makes a better product. The bezels and mounts they provide are very oem in appearance which I really like. Quality is top notch. The built in deutsch connector is a really nice feature.
One thing to note about color is that the "whiter" the light is the harsher it is on the eyes. The amber is very easy on the eyes.
Baja Designs uses a 5000k light when choosing white which is about perfect, but when it bounces back off of a highly reflective surface it is a bit harsh. For me, I would prefer 4000k for white, but no one offers that. In Diode Dynamics case, if choosing white they offer a 6000k which I could only imagine would be harsher. Aside from harshness I personally do not like anything above 5000k in something like a headlight.
That being said, if you want the lights to truly perform in fog and/or dusty conditions amber is the only choice.
Note, the photographs in the instructions that DD includes must be from a 1500 truck. On my HD the front frame to bumper attachment area is different than the photos show and one of the 3 fasteners on the factory fogs is a huge pain to remove because there is very little access to rotate the fastener. Once the factory fogs are removed the DD SS3's install very easily as they are not as bulky.