Can we see the Trex choice here.

I think trying to match your siding and brick is probably an exercise in futility because of the various undertones possible in beiges. Unless you have an HOA that is limiting your color choice I would be looking at a medium to dark brown - approximating a natural wood color. You will get better advice however if you show us pictures of the colors you're considering.

I like the coastal bluff. I would not go dark. I would do the railing & fascia white like your window trim.

Coastal Bluff sample

1. black railing/spindles, Coastal Bluff fascia
2. white railing/spindles, white fascia
   3)white railing, black spindles, white fascia
3. brown railing, white fascia

Thanks for your suggestions. Here are the color combos I am considering:

Your close-up pic seems different than your original pic. The first looked warmer and more beige. The second photo appears more grayish on my monitor. if so, i like the third pic.

Thanks Molly, I do see the difference in the photos. The close up is more accurate. Colors are definitely cooler.

I think all white railings look better here, and white fascia.

Your brick is a slightly busy pattern, and I think mixing black spindles in would make everything look too busy overall.

So what’s the final?

@Molly D. Coastal Bluff, white railing, coastal bluff fascia. Won’t be built until October. Busy deck season this year.