I'll take MK Saffiano over TB, at least based on these two purses. I bought them around the same time and the MK mini is thicker and seems more durable to me.
TB's is thinner and feels more like vinyl coated canvas. Not sure if it's the size or the candy coloring as I saw the Robinson Mini Square Tote in Luggage in store and the leather was thicker. On the upside, it's more malleable than the Mini Hamilton and I can fit more into it.