In your opinion, what colour is looks best for leather soles? Myself, I think the yellow-beige appearance look quite good.
Do you mean the sole edge or the sole bottom? For the sole edge, I like it to be slightly darker than the upper, meaning a medium brown for tan or cognac shoes. For sole bottoms, I've come over to Gabor's way of thinking and prefer the pale tan that Vass uses. I used to prefer the darker tan that the English makers will do, but that tends to run when it gets wet. As for why this matters when people don't see the soles of your shoes, even if that were true, I
would see them. It may not be sufficient to dress to please yourself, but it is still necessary.