I'll also mention another thing. Maybe it's psychological?
Once most people who have lots of experience with both PMs, you tend to see that most gradually come to like gold better. They hold onto the gold coin, preferring to spend the silver ones.
If I ever have to spend any of my PMs, I will spend my silver first, no matter what the Au:Ag ratio is.
There seems to be some fairly universal attraction of humankind to gold. Maybe that's from the very ancient past...
Gold is very special in its properties including outward appearance, that is, color and shine. Silver, on the other hand, is nothing out of the ordinary, you could easily confuse it with tin, for example...
To me, tin has more appeal