I personally prefer palladium hardware on almost every bag, gold being no exception. It really depends on the color of the metals you wear most often, at least in my opinion. Since nearly all my jewelry is platinum, white gold, or silver, palladium works best for me.
The easiest way to figure out which works best for you might be to remove all the jewelry & watch that you normally wear, and decide which HW color would work best with it!
Lucky girl, I have been waiting on a gold Birkin with PHW for a while.