Well the NZXT is a much bigger case than the 300 and more expensive, they are sort of different market segments. The NZXT is more a competitor with the CM 690 which I think is better. In general I would also put CM and Antec build quality over the NZXT. I would never buy the NZXT just because I think it is ugly (seen it irl) but between the two I guess it dpends on if you need the extra space or not. If not go with the Antec. Between the three cases I talked about I would always go for the CM 690 though.