I switch between these two depending on the size of my bag. The red caviar flat cardholder holds a surprising amount and works better for my smaller bags. The black flap cardholder can carry a bit more, but is also a bit more bulky so I use it in my larger bags. If I could only pick one, I would pick the flat cardholder since I don't usually carry a lot and it fits all my cards and a bit of cash folded in the center opening. The black flap cardholder is perfect if you need to carry more, but if it were my everyday cardholder I would get it in caviar since lamb probably isn't the best choice for an everyday SLG. Good luck deciding!