I just bought the black over the weekend, but I had the very same dilemma as you. Both colours are just beautiful and make the bag look completely different!
I always thought I would get the saddle, as it looks beautiful in photos, but I ended up choosing a black mini. I like the contrast of the hardware against the black leather, and I think I can use it more at night time than the saddle.
Black is more versatile, and a little dressier than the saddle. If your style is quite casual, then the saddle would be just perfect!