Over here the most popular size is 30cm, but someone else said that where they were it was the 35cm. Since there is no waitlist here anymore I can't really speak for a most requested, but my SA said that blue jean seems to come in randomly more often than others (although for the life of me I've never been so lucky to walk in on one!). He also said that people like the grained leathers since they are more resistant to scratches. I love the bicolor, but apparently it has only been coming out in box, so hes trying to steer me away from that