I have both...two calf boys and one caviar boy. I've had them for over a year and wear them regularly and neither the calf or caviar have shown any wear. If wear is a concern, I highly recommend the boy in calf or lamb (or goat if you can find it). I have several other Chanel pieces in lamb and adore them, but due to the wear patterns of boy bags I am hesitant to get a boy in lamb. Calf is much more hardy and durable than lamb and caviar is obviously the most durable choice, but if you prefer the softer, more luxurious look, calf is a great alternative to lamb. I also have a goat boy and it is super durable too, but boys are rarely released in goat. GLD!