Although CNET did not review the Samsung UND6300 series, we did review the UND6400 series.
Comparing the two on Samsung's Web site, the main difference is that the UND6400 has 3D capability, and includes two pair of 3D glasses; the UND6300 does not.
The 6400 has a "Graphite" finish compared with "Stone Gray" on the 6300. The latter also has a thicker bezel around the screen.
Both include Samsung's Smart TV Internet suite, but according to Samsung's feature comparison, the less-expensive 6300 gets a Web browser, and the 6400 does not. Despite the indication on Samsung's Web site that the 6300 has built-in Wi-Fi, it does not; both require optional, proprietary Wi-Fi dongles to connect to the Internet wirelessly. We also suspect that, despite what the Web site says, both include VGA inputs for computers.
As far as we can tell there are no other major differences between the two series. and we expect their 2D picture quality to be very similar. For more information, check out our full review of the