Yellow will work so much better if you ever drive in any sort of rain/snow/fog. It is seriously like night and day as compared to 8000K. Also the light output on the 3000K is a higher Lumen than the 8000K so they will technically be brighter as well.
Not a GP, but I thought my car might give an interesting comparison on colors for you and since my fog lights and low beams are right next to each other it is a good side by side comparison.
8000K low vs 3000K fog
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