Best is a relative term. Basically when folks talk about the "best" panel, they're referring to the Samsung-made S-PVA panel, because the way the pixels are aligned determines a lot of the panel's characteristics (without getting into the specifics of panel technology). Panel type is determined by availability at time of build, size, etc. To my knowledge, there is no guarantee that all builds of a specific model line will always have the same panel type. There are three ways to get a good idea of the type of panel you have. One, take a 10x or greater magnifying lens (the loupe test) and carefully take a picture of the pixel pattern and then compare that to a reference picture. Two, go into the Service Menu (something I don't recommend), look at the panel code, and then look up that information either here in this thread or online elsewhere, and two, sometimes the Version Number (TS01, etc) is good indicator of whether it is a Samsung-made panel or not. There is lots of info in this thread as to what the various Version Number codes mean (TS01, HS01, US02, etc).
As far as 10-bit color depth goes, that should be listed somewhere in the specs because there is no guarantee that ALL S-PVA panels are 10-bit. 10-bit panels will be nice because they can handle the wider color space that HDMI 2.0 will be able to carry, but that will be source dependent.