My black swift is ghw I love it but I think that perhaps phw is much sportier and makes the bag sleek and minimalistic even, gold is the ever present show of baroque it enriches almost every color to a point were Hermes elegance meets the original luxe metal, and with black the point is defined more by what purpose the bag will serve. Example my bouganvillier birkin was to be a sporty travel high hue color to over accent my more minimalistic look I got it with ghw because of how pinkish coral it looked and in the end I could not find myself in love with it , I felt it was like a 1972 las Vegas suite as in too much, so I changed it for a phw and all was right .
With black you can have the same or a very particular effect my swift is a work horse it's beautiful as is because but it looks more like a vinatge first birkin because of the gold so perhaps phw is more 90s, yes as in minimal sober basic in shape and style but it's less complicated ,again its very personal but with black the decision lies in the following concepts
Classic baroque Versailles or minimalist sleek chrysler building is you can answer that fast then you have it !
If the esthetic of Versailles is for you the gold,if its the Chrysler building then phw ,I find it helps to move from bags to bigger scale things if the allure of one of them is more appealing to you than the other ,again you have it ! Its the subconscious that tells the truth and we tell it through something you can not buy .hope it makes sense and helps birkel.
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