Remember I'm only talking about my experience with my TV. All tellies are not equal. Some may be better than mine and some will surely be worse. I understand that plasma is generally meant to be slightly better for 3D, but again, all is not equal. From everything I've read the Samsung that I bought is supposed to be one of the best 3D sets currently available. I have very little other experiences to compare it to though. I didn't buy it for 3D anyway. I bought it for the size and image quality.
Eug, if you do buy the Samsung, PM me and I'll fire over the best calibrated settings as taken from the AV Forums. Also be aware that although the black levels are amazing, you WILL sometimes see some mild backlight blooming with a black scene in a pitch black room, especially off-angle. That's pretty much just LCD for you though. Everything else is so good that it's a non-issue (for me at least).