I like the White Stuff one more. The All Saints one looks like it is trying to be like multiple far more expensive bags (Polene do a style like this or example) so it seems a bit trendy, but it's not cheap. The White Stuff one is more unobtrusive (and much cheaper, but still leather).
The only thing that might change my mind is your frame size. I would feel like I was being consumed by the All Saints bag, but if you are tall and broad shoulders, it might suit your frame size well.